ML18139A514

LER 80-015/03L-0:on 800816,after Pressurization of Accumulator Tanks,Level Indicator for B SI Accumulator Indicated 61% Level,Above Tech Spec Max of 58.3%.Caused by Condensation & High Pressure in Nitrogen Feed Line

ML18139A514
Person / Time
Site:	Surry
Issue date:	09/12/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A506	List: ML18139A505 ML18139A512 ML18139A513 ML18139A514
References
LER-80-015-03L-03, LER-80-15-3L-3, NUDOCS 8009220402
Download: ML18139A514 (2)

Text

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REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES {io)

I Unit #2 was critical at 0% power. O~ating personnel were pressurizing the accumulator!

tanks. After pressurization, the level indicator for 'B' SI accumulator indicated a

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high level of 61%, exceeding the T.S. maximum of 58.3%. This event is contrary to T.S.

[I:ill 3:3.A.2 and is reportable as per T.S. 6.6.2.b.(2). The redundant accumulators were

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available, therefore the safety and health of the public were not affected,

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

JWater was drained from the tank to get the level within the.Technical Specifications.

Subsequent to this event, it was determined that condensation in the dry reference leg and high pressure from the nitrogen feed line caused the instrument to read high. The reference leg has been drained and the nitrogen pressure re-routed to reduce instrument shock from the high pressure line.

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J. L. Wilson (804) 357-3184 0 C.

NAME OF P R E P A R E R - - - - - - - - - - - - - - - - - - PHONE:-------------

ATTACHMENT 1 SURRY POWER STATION, UNIT 2 DOCKET NO: 50-281 REPORT NO: 80-015/03L-0 EVENT DATE: 08-16-80 TITLE OF REPORT: HIGH LEVEL ON ACCU1'1ULATOR TANK 2-SI-TK-B

1. DESCRIPTION OF EVENT:

Unit No. 2 was at critical at 0% power conducting low power physics testing.

The operator was pressurizing the accumulator tanks during startup testing.

The indicated level of accumulator 2-SI-TK-B increased when the tank was pressurized. After pressurization, the level indicators showed a level of 61%,

exceeding the Technical Specifications maximum level outlined in 3.3.A.2 of 58.3%._ After four hours, the level was still higher than the T.S. level, requiring that a reactor shutdown be initiated. Two minutes later, the level was within the T.S. limit and the reactor was brought back to critical status.

This event is reportable in accordance with Technical Specifications 6.6.2.b.(2).

2. PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT SYSTEMS:

Two accumulators were operable at all times during the event. This is the minimum number assumed by the safety analysis. Therefore, the health and safety of the public were not affected.

3. CAUSE OF EVENT:

The higher reading was caused by condensation in the dry reference legs. In addition, the reference leg piping taps directly into the nitrogen feed line, causing fluctuations in the level indication.

4. IMMEDIATE CORRECTIVE ACTION:

The immediate corrective action was to drain water from the accumulator tank to lower the level.

5. SUBSEQUENT CORRECTIVE ACTION:

The refe.rence legs were drained of condensation. The valve from the nitrogen feed line was closed and the valve on the upper level tap on the tank was opened to reduce the effects of nitrogen charging by allowing the large accumulator nitrogen volume to act as a cushion.

6. ACTIONS TAKEN TO PREVENT RECURRENCE:

None required.

7. GENERIC IMPLICATIONS:

There are no generic implications.