ML20080E109

Provides Followup to Util Re Environ Qualification of safety-related Electrical Equipment. Justification for Continued Operation W/Components Not Fully Qualified Provided

ML20080E109
Person / Time
Site:	Fort Saint Vrain
Issue date:	08/15/1983
From:	Brey H PUBLIC SERVICE CO. OF COLORADO
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
IEB-79-01B, IEB-79-1B, P-83280, TAC-42527, NUDOCS 8308300725
Download: ML20080E109 (2)

Text

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pul>1ie Hervice Company f?OnBarade

2420 W. 26th Avenue, Suite 1000 Denver, Colorado 80211 August 15, 1983 Fort St. Vrain Unit No. 1 P-83280 Mr. John T. Collins l Regional Administrator <

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l-'3 Nuclear Regulatory Commission

611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 i

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DOCKET N0.: 50-267

SUBJECT:

Environmental Qualification of Safety Related Electrical Equipment

REFERENCE:

P-83178, May 17, 1983 Lee to Collins

Dear Mr. Collins:

This letter is a follow-up to PSC's Nay 17, 1983 submittal P-83178 concerning Environmental Qualification of Safety Related Electrical Equipment.

In the referenced letter, we committed to testing two co 1ponent model types, which comprise a total of three plant items, no later than August 31, 1983. We are pleased to ir. form you that we have successfully tested both actuator types. We have received the test reports from the test laboratory, and will enter them into our document system. This commitment item is, therefore, closed.

Our qualification records audit, now approximately 85% complete, has uncovered an additional six (6) component models that require further testing. Of these, five are valve actuators and one is a linear voltage differential transducer (LVDT).

PSC believes that there is adequate justification for continued safe operation with these components not fully qualified. These justifications are presented below on an item by item basis.

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P-83280 Page 2 The LVDT is used in conjunction with six valves as a feedback device for valve position control. Each of these valves features a

" designed failure mode", i.e. the valves fail in the safe direction.

On four of the valves, the LVDT's can be overridden by hand switches.

The other two valves have alternate flow paths that ensure safe shutdown cooling capability.

The first actuator model type is used as part of the helium circulator auxiliary system. It is similar in construction to actuators that have been qualified and also features a designed failure mode.

I The second actuator model type is also used as part of the helium ]

circulator auxiliary system. It has a designed failure mode and a local manual override, i.e., handwheel. It is similar in design to qualified components.

The third actuator model type is utilized with a valve that provides cooling water for the emergency diesel generators. It, too, has a designed failure mode. The valve can also be bypassed by a manual valve.

The fourth actuator model type is used to bypass reheat steam to the condenser. It features a designed failure mode and is similar in construction to qualified models.

The fifth actuator model type is used in conjunction with the reserve shutdown system. It is at an extreme distance from possible line breaks and is similar in design to other qualified models.

Because of the above reasons, we believe that we do not compromise the health and safety of the public by operating with these components not fully tested.

We are currently proceeding with the testing of these components.

All testing should be complete by no later than March 31, 1984. We are fully confident that each of these components will successfully withstand their respective steam line rupture simulation tests.

Upon completion of the testing, or if a change tc any commitment is required, the staff will be notified.

Very truly yours,

)

./J.L.Brey, Manager v Nuclear Engineering Division HLB /SM:pa

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