ML20052G370

LER 82-009/03L-0:on 820408,4.16-kV Safeguards Undervoltage Relays Did Not Meet 0-volt Time Delay Spec.Caused by Manufacturer Characteristic Curves.Relays Not Capable of Less than 0.38-s.Tech Spec Change Requested on 820427

ML20052G370
Person / Time
Site:	Point Beach
Issue date:	05/07/1982
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052G363	List: ML20052G362 ML20052G370
References
LER-82-009-03L, LER-82-9-3L, TAC-48375, TAC-48376, NUDOCS 8205180303
Download: ML20052G370 (3)

Text

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U. S. NUCLEAR HEGULATORY COMMISSION l (7 71)

LICENSEE EVENT REPORT CONTROL 8tOCK;l (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATIONI

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EVENT DESCHIPTION AND PHOBAHLE CONSEQUENCES h i o 2 lOn 04/08/82, while conducting a review of the Technical Specification l l0l3llsetpoints and past test data for the 4.16 KV safeguards UV relays for l

[o l4 l ldnits 1 and 2, it was determined that the relays did not meet the 0 voltg i

', l o i s i l time delay specification (.3 seconds +5%) as per TS Table 15.3.5-1.

j~ O o lThis occurrence is reportable in accordance with Technical Specifi- l 0 7 l cation 15.6.9.2.B.1. The public health and safety was not endangered. l I

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~ lil0llThe manufacturer's characteristic curves for the 4.16 KV UV relay indi- l

! i i lcate .4 seconds +5% as the time delay setpoint at 0 volts. The relays I 1

, Iare, therefore, not capable of a time delay less than .38 seconds l J

i 3 l ( . 4 seconds -5%) . TS Change Request #77 was submitted on 04/27/82 to l

, i 4 [ correct the 9 volt time delay settino. I 7 8 9 80 ST 5  % POWER OTHER STATUS OISCO RY DISCOVERY DESCRIPTION i s [Ej@ l0 l 7 l6 l@l N/A l l B l@l Review of test data. l ACitVITY CO TENT RELEASED OF HELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE

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l ATTACl! MENT TO LICENSEE EVENT REPORT NO. 82-009/03L-0 Wisconsin Electric Power Company Point Beach Nuclear Plant, Unit 1 Docket No. 50-266 ,

On April 8, 1982 while conducting a review of the Technical Specification setpoints and past test data for the i 4.16 KV safeguards undervoltage relays for Units 1 and 2, it was determined that the relays did not meet the zero V time delay specification (.3 seconds +5%) as per Technical Specifi-cation Table 15.3.5-1, Iten 10a.~ This condition has existed on these relays since testing began with the new Technical Specification setpoints in March 1981. This occurrence is reportable in accordance with Technical Specification 15.6.9.2.B.1 as an engineered safety feature instrument setting which was found to be less conservative than that established by the Technical Specifications, but which did not prevent the fulfillment of the functional requirements of the affected system.

Prior to March 1981, the 4.16 KV undervoltage relays were tested to the limits on the manufacturer's characteristics curve for the Westinghouse-type CV-7 undervoltage relay.

On March 31, 1981, License Amendments 47 and 52 required testing the Units 1 and 2 4.16 KV undervoltage relays in accordance with Technical Specifications.

The Technical Specification setting for the 4.16 KV undervoltage relay for the zero V time delav is .3 seconds +5% as indicated in Table 15.3.5-1, Item 10a. The manufacturer's character-istics curve for the undervoltage relays show .4 seconds +5%

as the time delay setpoint for the zero V time delay. Th~ relays are, therefore, not capable of a time delay less than .38 seconds

(.4' seconds -5%).

It was discovered that the 4.16 KV undervoltage relay test data was being~ compared to the past test data and relay characteristic curves rather than the Technical Specification setpoint limits. This accounts for the fact that the deviation from the Technical Specification settings was not discovered until the April 9, 1982 review of the test data and the Technical Speci-fication setpoints. The last 4.16 KV.undervoltage relay performed on Units 1 and 2 was November 1981 and May 1981 respectively.

, The relays actual time delay at zero V was .33 seconds during the last set of tests.

~. - - .- - , . - . .

g I ATTACHMENT TO LICENSEE EVENT REPORT NO. 82-009/03L-0 It appears that during Technical Specification drafting of Table 15.4.5-1, Item loa, that the characteristic curve for the undervoltage relay was misinterpreted. The-setpoint chosen for the~ Technical Specification should have been .4 seconds vice .3 seconds.

On March 9, 1982, Wisconsin Electric received a verbal

• waiver from Mr. Trammel of the NRC to increase the.zero V time delay setpoint to .4 seconds until Technical Specification Change '

Request-No. 77 is approved. This Technical Specification change.

increases the setpoint for the zero V time delay to $.4 seconds +10%.

All Technical Specification test data will be reviewed to the Technical Specification setpoints.to ensure full compliance with the Technical Specifications. At all times the relays operated in agreement with their characteristic curve and were operable as designed. ,

The Resident Inspector has been notified of this event.

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