SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549


                                   FORM 8-K/A

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


Date of report (Date of earliest event reported)  June 17, 1997


                         ZENITH NATIONAL INSURANCE CORP.
             (Exact Name of Registrant as Specified in its Charter)


        Delaware                         1-9627                95-2702776
(State or Other Jurisdiction           (Commission           (IRS Employer
    of Incorporation)                  File Number)       Identification No.)


21255 Califa Street, Woodland Hills, CA                              91367-5021
(Address of Principal Executive Offices)                             (Zip Code)

Registrant's telephone number, including area code  (801) 713-1000


          (Former Name or Former Address, if Changed Since Last Report)


Item 5.  Other Events.

     Zenith National  Insurance  Corp.  (the  "Company")  issued a press release
dated  June 17,  1997,  (a copy of  which  is  attached  as an  exhibit  hereto)
announcing that its wholly-owned subsidiary, Zenith Insurance Company ("Zenith")
has entered into an agreement (a copy of which is attached as an exhibit hereto)
with  RISCORP,  Inc.  ("RISCORP").  The key  elements  of the press  release are
summarized below:

     1.  Zenith has agreed to purchase  all of the assets of RISCORP  related to
its  workers'  compensation  business,  including  RISCORP's  existing  in-force
insurance business as well as the right to all new and renewal policies.  Zenith
also  agreed  to  purchase   RISCORP's   "First  Call"   managed  care  workers'
compensation system. After the transaction closes, RISCORP will no longer engage
in the workers' compensation or managed care business.

     2. Zenith will assume certain  liabilities  related to RISCORP's  insurance
businesses  in  connection  with  the  transaction,   including  $15,000,000  in
indebtedness  of RISCORP.  The purchase  price paid by Zenith to RISCORP will be
the difference between the book value of the assets purchased and the book value
of the liabilities  assumed by Zenith on the closing date,  subject to a minimum
purchase price of $35 million. The purchase price will be payable in cash.

     3. Zenith will finance the purchase with bank financing and internal funds.

     4. Zenith and RISCORP have also  entered into an agreement  under which all
new and renewal  RISCORP  policies  issued  after today (June 17,  1997) will be
reinsured by Zenith,  an A.M. Best Company A+ (Superior)  rated  carrier,  until
Zenith assumes such policies at the closing.

     5. Zenith will not be purchasing  the stock of RISCORP or its affiliates or
(except as noted above) assuming the corporate  liabilities of these  companies,
including  liabilities related to any present or future litigation against those
companies.

     6. The  closing of the  purchase  is subject to the review and  approval by
appropriate state and federal regulatory agencies and by RISCORP's shareholders.
The  agreement  has been  approved by the Boards of  Directors  of the  Company,
Zenith, and RISCORP.

Item 7.  Financial Statements and Exhibits

         c.  Exhibits

             Exhibit Number 10.1  Asset Purchase Agreement, dated as of June 17,
                                  1997, by and among Zenith Insurance Company
                                  and RISCORP, Inc., RISCORP Management
                                  Services, Inc., RISCORP of Illinois, Inc.,
                                  Independent Association Administrators
                                  Incorporated, RISCORP Insurance Services,
                                  Inc., RISCORP Managed Care Services, Inc.,
                                  CompSource, Inc., RISCORP Real Estate
                                  Holdings, Inc., RISCORP Acquisition, Inc.,
                                  RISCORP West, Inc., RISCORP of Florida, Inc.,
                                  RISCORP Insurance Company, RISCORP Property &
                                  Casualty Insurance Company, RISCORP National
                                  Insurance Company, RISCORP Services, Inc.,
                                  RISCORP Staffing Solutions Holding, Inc.,
                                  RISCORP Staffing Solutions, Inc. I and
                                  RISCORP Staffing Solutions, Inc. II.

             Exhibit Number 99.   Press Release of Zenith National Insurance
                                  Corp. dated June 17, 1997.


                                    SIGNATURE

     Pursuant to the  requirements  of the  Securities  Exchange Act of 1934, as
amended,  the  Registrant has duly caused this report to be signed on its behalf
by the undersigned hereunto duly authorized.


                                          ZENITH NATIONAL INSURANCE CORP.


Dated: July 11, 1997                      By: /s/ Fredricka Taubitz
                                              Name:  Fredricka Taubitz
                                              Title:  Executive Vice President
                                                      & Chief Financial Officer