05000280/LER-1981-021-03, /03L-0:on 810704,chemical Addition Tank Found to Contain 86% of Vol Required,Following Level Transmitter Recalibr.Caused by Use of Pure Water Instead of Sodium Hydroxide Solution in Original Calibr Procedure

/03L-0:on 810704,chemical Addition Tank Found to Contain 86% of Vol Required,Following Level Transmitter Recalibr.Caused by Use of Pure Water Instead of Sodium Hydroxide Solution in Original Calibr Procedure

ML20009H382
Person / Time
Site:	Surry
Issue date:	07/31/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009H379	List: 05000280/LER-1981-021, Forwards LER 81-021/03L-0.W/o Encl LERs 81-022/03L-0 & 81-028/03L-0 05000280/LER-1981-021-03, /03L-0:on 810704,chemical Addition Tank Found to Contain 86% of Vol Required,Following Level Transmitter Recalibr.Caused by Use of Pure Water Instead of Sodium Hydroxide Solution in Original Calibr Procedure
References
LER-81-021-03L-01, LER-81-21-3L-1, NUDOCS 8108100042
Download: ML20009H382 (2)

LER-1981-021, /03L-0:on 810704,chemical Addition Tank Found to Contain 86% of Vol Required,Following Level Transmitter Recalibr.Caused by Use of Pure Water Instead of Sodium Hydroxide Solution in Original Calibr Procedure

Event date:
Report date:
2801981021R03 - NRC Website

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4 ATTACHMENT I SURRY POWER STATION, UNIT 1 DOCKET NO:

50-280

'N REPORT NO:

81-021-03L-0

/

EVENT DATE:

07-04-81 TITLE OF EVENT:

CAT LEVEL LOW l.

DESCRIPTION OF EVENT

With Unit I at intermediate shutdown, the Chemical Addition Tank (CAT) was discovered to contain 86% of the required volume, after recalibration of the level transmitter. This is contrary to T.S.3.4.A. (4), and reportable per T.S.-

6.6.2.b(4).

A review of unit operating records revealed that despite the trans-mitter having been incorrectly calibrated since the start of plant operations, the CAT volume had been below the TS minimum for only one' previous period, about 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> in June 1978.

2.

PROBABLE CONSEQUENCES:

The CAT would be used to add sodium hydroxide to the Containment Spray, following a Design Basis Accident, in order to facilitate removal of radioactive lodine from the containment atmosphere, thus reducing the concentration of airborne fission products available for leakage.

Since the peak pressure inside the containment would occur within one minute following DBA the CAT would have still provided sodium hydroxide to the sprays during the period of greatest potential for leakage to the environment.

(

s, Since the CAT volume was adequate during the great majority of the time the unit was in operation and the system was not called upon to mitigate a DBA, the health and safety of the public were not affected.

3

CAUSE

The incorrect calibration of the level transmitter resulted from the use of pure water rather than a solution of denser 18% NaOH in the original calibration procedure. This error caused the transmitter to Indicate approximately 100%

level with an actual level of 82%.

4.

IMMEDIATE CORRECTIVE ACTION

The CAT was filled to restore level to above the Technical Specification minimum.

Difficulties with the sodium hydroxide addition pump resulted in approximately

- 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> and 10 minutes being required to fully restore level.

5.

SUBSEQUENT CORRECTIVE ACTIONS:

None required.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

The calibration procedures have been revised to take into account the density difference between NaOH and pure water. The proper tank curve was developed f.

and placed in the operator curve book. The Unit 2 curve was verified to be s_

correct.

7 GENERIC IMPLICATIONS:

None.