ML19309F352

LER 80-028/01T-0:on 800411,main Steam Header Pressure Transmitters 1-PT-1-2B,-9A,-9B,-20A,-20B & -27B Found to Lack Environ Qualification to Substantiate long-term post-high Energy Line Break Operation.Replacement Ordered

ML19309F352
Person / Time
Site:	Sequoyah
Issue date:	04/24/1980
From:	Hereford J TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19309F351	List: ML19309F350 ML19309F352
References
LER-80-028-01T, LER-80-28-1T, NUDOCS 8004290316
Download: ML19309F352 (2)

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, Tannessas Vallsy Authority Szquoyah Nuclear Plant LER SUPPLEMENTAL INFOP3!ATION SQRO 327/8028 Technical rpecification Involved None Reported Under Technical Specificaticn 6.9.1.12.1 Date of Occurrence: 4/11/80 Time of Occurrence: 0750 EST Identification and Description of Occurrence:

The following Westin'ghouse Class lE pressure transmitters (Foxboro EllGM-HSAE1) located outside containment in the main steam valve rooms do not have the necessary environmental qualifications to substantiate their required long-term operation following a high energy line break:

TVA Tag Nos. PT-1-23, 9A, 93, 20A, 203, and 27B (W Nos. 515, 524, 525, 534, 535, and 545).

NOTE: PT-1-12 and 23 are deleted from this report (they were included in the telecopy of this occurrence transmitted 4/14/80). Since these instruments are located in a separate roo= and not in the valve roo=s as originally reported.

Conditions Prior to Occurrence:

Unit in Mode 5 with all fuel loaded.

Action specified in the Technical Specification Surveillance Requirements met due to inoperabic eauipment. Describe.

4 N/A ,

Apparent Cause of Occurrence:

As shown in FSAR table 3.11-2 the expected temperature can reach greater than 290 F while the instruments are qualified for 1300 F operation.

Analysis of Occurrence:

Should a high energy line break in the =ain steam valve room, the main steam pressure transmitters possibly would not be capable of performing their intended post accident functions.

There was,no ha:ard to public health and safety. .

CorrectiveAction$

Subject transmitters are to be replaced with those capable of withstanding the accident environment in main steam valve rooms. This will be completed prior to entry into Mode 3.

Failure Data:

N/A

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