ML20199F364

Safety Evaluation Supporting Licensee Response to Generic Ltr 83-28,Items 3.1.1 & 3.1.2 Re post-maint Testing of Reactor Trip Sys Components

ML20199F364
Person / Time
Site:	Palo Verde
Issue date:	06/18/1986
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20199F362	List: ML20199F356 ML20199F364
References
GL-83-28, TAC-59165, NUDOCS 8606240298
Download: ML20199F364 (2)

Text

'.

SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION GENERIC IMPLICATIONS OF SALEM ATWS EVENT GENERIC LETTER 83-28, ITEMS 3.1.1 AND 3.1 2 ARIZONA PUBLIC SFRVICE COMPANY, ET AL.

. PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2 AND 3 DOCKET NOS. STN 50-528, 50-529 AND 50-530 I. INTRODUCTION On February 25, 1983, during startup of the Salem Unit 1 Nuclear Plant, both circuit breakers in the Reactor Trip System failed to open automatically upon receipt of a valid trip signal. As a result of that event, the NRC's Office of Inspection and Enforcement issued IE Bulletin 83-01 which described the event and requested specified prompt corrective and preventive actions by licensees. As the cause and ramifications of the event were more clearly developed, the NRC's Office of Nuclear Reactor Regulation issued on July 8, 1983, Generic Letter 83-28, " Required Actions Based on Generic Implications of Salem ATWS Events." This letter addressed issues related to reactor trip system reliability and general management capability. The letter was sent to all licensees of operating reactors, applicants for operating licenses and holders of construction permits.

One of the areas of reactor trip system reliability considered in Generic Letter 83-28 (GL 83-28), is that of post-maintenance testing of reactor trip system components. This is identified in GL 83-28 as Items 3.1.1 and 3.1.2. This evaluation addresses the acceptability of the response to these items provided by Arizona Public Service Company, et al. (APS) for the Palo Verde Nuclear Generating Station, Units 1, 2 and 3 (PVNGS).

II. EVALUATION Items 3.1.1 and 3.1.2 of GL 83-28 state as follows:

"1. Licensees and applicants shall submit the results of their review of test and maintenance procedures and Technical Specifications to assure that post-maintenance operability testing of safety-related components in the reactor trip system is required to be conducted and that the testing demonstrates that the equipment is capable of performing its safety functions before being returned to service."

"2. Licensees and applicants shall submit the results of their check of vendor and engineering recommendations to ensure that any appropriate test guidance is included in the test and maintenance procedures or Technical Specifications, where required."

By letter dated November 3, 1983, APS responded to a number of GL 83-28 items, including Items 3.1.1 and 3.1.2.

8606240298 860618 ,

PDR ADOCK 05000528 ,,

p PDR

2 Regarding Item 3.1.1, this letter stated a review of all Reactor Trip System test and maintenance procedures which had been approved at that

• time, indicated that post-maintenance testing to assure operability was included. The letter also stated all procedures still in draft form

. will have retest requirements included, as required.

Regarding Item 3.1.2, (incorporation of vendor recommendations in test

< 'and maintenance procedures), the APS letter of November 3, 1983, stated a review of all approved Test and Maintenance procedures indicated the

. latest v'endor and engineering recommendations available to APS had been

, incorporated. APS also stated any deviations from vendor and/or 9 engineering recommendations have been reviewed by the vendor and found

,\ 'to be satisfactory.

9} e .

III. CJNCLUSION Based on confirmation by APS that all test and maintenance procedures for the Reaccor Trip System include requirements for post-maintenance testing that assures equipment operability, we conclude APS has

,, ~ acceptably patisfied for PVNGS, the actions requested by Item 3.1.1 of 3,  ; Generic Let.ter 83-28.- Accordingly , this item is closed.

Bised on cegfirma,cion by APS that the 1stest vendor and engineering re' commendations have been incorporated i:t the test and maintenance

', procedured for the Reactor Trip System, as appropriate, and that any 5 deviations from the recommendations hav4s been reviewed by the vendor and found sat.isfactory, we conclude APS bas acceptably satisfied for PVNGS, the actiory requested by Item.3.1.1 af Generic Letter 83-28.

Accordiogly, this item is cicsed.

. i i T e Date: , ! ! ,<

f, ..' ,

Principal Con'tributor: '

G. Zwetzig i

i t

1 he,

_ _ __ . _ _. , _ _ . ,