05000206/LER-1981-027, Forwards LER 81-027/01T-0.Detailed Event Analysis Submitted

Forwards LER 81-027/01T-0.Detailed Event Analysis Submitted

ML20038B695
Person / Time
Site:	San Onofre
Issue date:	11/23/1981
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelker H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20038B699	List: 05000206/LER-1981-027, Forwards LER 81-027/01T-0.Detailed Event Analysis Submitted 05000206/LER-1981-027-01, /01T-0:on 811109,routine Weekly Boron Analysis of Refueling Water Storage Tank Indicated Less than Tech Spec Limit.Caused by Nonrepresentative Boron Concentration Samples Misleading Operators Re Actual Concentration
References
NUDOCS 8112090032
Download: ML20038B695 (2)

LER-1981-027, Forwards LER 81-027/01T-0.Detailed Event Analysis Submitted

Event date:
Report date:
2061981027R00 - NRC Website

text

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DECEIVED

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Southern California Edison Company

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U. S. Nuclear Regulatory Commission g,' 4 h4

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Office of Inspection and Enforcement Region V (9kg 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 bA Q-Gh

' Attention: Mr. R. H. Engelken, Director rs j

DOCKET No. 50-206 SAN ON0FRE-UNIT 1

Dear Sir:

This letter provides a follow up report describing a reportable occurrence involving the Refueling Water Storage Tank. Submittal is in accordance with the reporting requirements stipulated in Section 6.9.2(a) of Appendix A to the Provisional Operating License DPR-13. This occurrence was originally reported by our letter dated November 10, 1981.

On November 9,1981, at 1508, at routine boron analysis of the contents of the Refueling Water Storage Tank was out of specification at 3731 ppm. Appendix A Technical Specification 3.3.3 requires a minimum boron concentration of not less than 3750 ppm. Within the one hour allowed by Technical Specification 3.0, the refueling water storage tank boron concentration was increased above the minimum permissible.

Our investigation into this event determined that non-representative boron concentration samples were taken the prior week. Sufficient time for adequate mixing must pass during Refueling Water Storage Tank recirculation before a representative sample can be taken.

Plant procedures were reviewed and two improvements have been made:

1.

A precaution has been added to warn operators that adequate time for tank mixing must be allowed prior to obtaining boron concentration samples.

2.

Following a refueling water storage tank boration or dilution, boron concentration samples must agree with predicted concentration within specified limits.

If agreement is not reached, the tank will continue to be recirculated and sampled until this condition is satisfied or consistent sample results are obtained.

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0112090032 811123

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gDRADOCK 05000206 PDR

Gr U. S. Nuclear Regulatory Comission It is concluded that actions taken during this event were consistent with the requirements of the Unit 1 Technical Specifications and that plant conditions were maintained such that there was no effect on public health and safety.

Sincerely,

/2 b vf G

Attachment: Licensee Event Report No.81-027

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cc:

U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Office of Management Information & Program Control (MIPC)

Institute of Nuclear Power Operations L. F. Miller (USNRC San Onofre Unit 1 Resident Inspector) 1 l

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