05000327/LER-1981-067-01, /01T-0:on 810626,while in Mode 4,site Evaluation Identified That Steam Generator Level Transmitters 1-LT-3-148,156,164,172,174 & 175 Would Fail During Loca. Caused by Incorrect Insulating Sleeving

/01T-0:on 810626,while in Mode 4,site Evaluation Identified That Steam Generator Level Transmitters 1-LT-3-148,156,164,172,174 & 175 Would Fail During Loca. Caused by Incorrect Insulating Sleeving

ML20009G033
Person / Time
Site:	Sequoyah
Issue date:	07/08/1981
From:	Harding M, Wilkey A TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009G026	List: 05000327/LER-1981-067, Forwards LER 81-067/01T-0 05000327/LER-1981-067-01, /01T-0:on 810626,while in Mode 4,site Evaluation Identified That Steam Generator Level Transmitters 1-LT-3-148,156,164,172,174 & 175 Would Fail During Loca. Caused by Incorrect Insulating Sleeving
References
LER-81-067-01T, LER-81-67-1T, NUDOCS 8108030264
Download: ML20009G033 (6)

LER-1981-067, /01T-0:on 810626,while in Mode 4,site Evaluation Identified That Steam Generator Level Transmitters 1-LT-3-148,156,164,172,174 & 175 Would Fail During Loca. Caused by Incorrect Insulating Sleeving

Event date:
Report date:
3271981067R01 - NRC Website

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LICENSEE EVENT REPORT

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COTT G8 69 EVENT DATE 74 7S REPORT D ATE 60 60 61 DOCKET Nuv6EM i

8 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h M nn 6-26-81. a safety evaluationi M b ith unit 1 in Mode. 4 (preparatory to matofine Mnan inspection l son FEB 8118 aqd the results of an equipment 10131I based on nonconformance renort steam cenerator level transmitters 1-LT-3-148, 156, 164, 1

10141 l at the,ite identified that O s l 172. 174 and 175 would fail durine a LOCA. The transmitters are reOuired during Modes l 0 6 l

1. 2. and 3 by Technical Specifications 3.3.3.5 and 3.7.1.2.

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No previous occurrences.

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i1 121 1 Tests had shown that teflon becomes brittle and deteriorates with a substantial Ii11l l intnernrod rndineinn anno 9,and nn nn annim ont inenon-4nn,nd cub c o n,, n n e enfory into Mode 3.

the affected transmitter amplifiers were replaced prior to entry 11 i+11 evaluation.

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M. R. Harding /A. M. Wilkey Phone:

(615) 842-8317 sf

LER SUPPLEMENTAL INFORMATION The Foxboro Company has identified two deficiencies in specific trans-mi',te rs. The first deficiency involves the use of incorrect insulating sleeving (i.e., teflon) on transistor and zener diode lead wires in the amplifier. Foxboro testing has demonstrated that tefler will become brittle and deteriorate with substantial integrated dose (approximately 200 megarads). Teflon sleeving can withstand an integrated dose of ten megarads. Integrated doses of greater than ten megarads will only be obtained during an accident (LOCA) inside containment. The integrated dose during normal operation will be less than ten megarads in all areas of i~. plant; therefore, based on this information and Sequoyah Nuclear Plas.i's inspection program, the transmitter amplifiers identified in table 1 were replaced prior to entry into Mode 3.

These transmitters are required for steam generator level control (Auxiliary Feedwater) and for post-accident monitoring.

The second deficiency involves capacitor degradation. Degradation of this capacitor is a function of time and service conditions with heat, being the primary contributor. In discussions with the Foxboro representative, he has related to us that a temperature of around 100 F will cause an instru-ment drift of between 1/2-1 percent within the first year. The capacitor will also be able to withstand high temperature peaks for a short duration; therefore, based on this information and Sequoyah's inspection program, the transmitter amplifiers identified in table 2 were replaced.

The amplifiers to the other Foxboro instruments as identified in table 3 are expected to be replaced at the next outage where sufficient time is available. We believe that there is no need to replace these transmitters at this time for the following reasons.

1.

Cold leg accumulator pressure transmitters (1-PT-63-86/61/62/106/108/126/128)

A.

The average temperature of lower cogtainment during normal operation is maintained between 100 F and 120 F; therefore, the expected instrument drift is less than the indicator channel eccuracy.

B.

The instruments serve no safety. function duting an accident.

They are only use(

.o verify accumulator pressure.

2.

RHR cold leg injection flow rate (1-FT-63-91C/92C)

A.

The transmitters do not contain teflon wire; therefore, they will not deteriorate on the radiation field.

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B.

The normal temperature in the Auxiliary Building (El. 690) is approximately 100 F and on the high energy line break is approx-imately 117 F.

This will cause an ins.trument drif t of around 1/2

- 1 percent in the first year, which is within indicator channel accuracy.

C.

The instruments serve no safety function. They are only used to verify RER flow during an accident.

3.

Main steam line pressure (1-PT-1-2B/20B/27B/9A/9B/20A)

The transmitters are located in the main steam vault rooms; A.

therefori, they will not see greater than ten megarads inte-

gg grated dose.

The normal temperature in the vault rooms is around 120 F withI B.

peak temperature approximately 300 F (accident) for a short 0

This will cause an instrument drift of around 1/2-1 duration.

percent in the first year, which is within the instrument accuracy.

C.

The instruments are input to SSPS; however, the instrument drift is small.

4.

Dead weight tester (PI-68-338)

A.

Serves no safety function.

Foxboro, in its letter to TVA, has identified several transmitters with no TVA tag numbers. These spare transmitters will be inspected. Those found having deficiencies will be replaced. Foxboro has also identified trans-mitters on Unit 2 which will ba required to be checked and replaced where The inspection program for the Unit 2 transmitters has been necessary.

initiated.

This defect has previously been reported by telephone based on preliminary information.

TABLE 1 Mode Required TVA Tag #

Serial No.

Teflon Wire to be Operable 1-LT-3-148 2805612 Yes 1, 2, 3 1-LT-3-156 2805614 Yes 1, 2, 3 1-LT-3-164 2S05616 Yes 1, 2,~3 1-1.T-3-272 2805620 Yes 1, 2, 3 1-LT-3-174 2805624 Yes 1, 2, 3 1-LT-3-175 3119351 Yes 1, 2, 3

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TABLE 2 Mode Required TVA Tag #

Serial No.

Capacitor to be Operable 1-LT-3-171 2805618 CDE/TX-65-3313 1,2,3 1-LT-3-173 2805622 CDE/TX-65-3313 1,2,3 1-PT-61-832 2645557 Unqualified amplifier 1, 2, 3 1-PT-68-68*

3045140 Unqualified amplifier 1,4,3,4

• During the inspection, these transmitters had the wrong amplifier.

An investigation into the cause for this discrepancy has been initiated.

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- l TABLE 3 TVA TAG #

SERIAL NO.

1-PT-1-9A 4006312 1-PT-1-9B 3119350 l-PT-1-20A 3119342 1-PT-1-2B 2645561 i

1-PT-1-20B 2645563 3

l-PT-1-27B 2645562 i

l 1-PT-63-86 2645558 l-FT-63-91C 3991009 1-FT-63-92C 3991007 1-PT-63-61 2645560 1-PT-63-62 2645559 l-PT-63-106 2645556 1-PT-63-108 2645555 1-PT-63-126 2645554 i

l-PT-63-128 2645553 1-PT-68-338 2504276 i

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