05000312/LER-1981-015, Forwards LER 81-015/04T-0.Event Analysis Submitted

Forwards LER 81-015/04T-0.Event Analysis Submitted

ML19350B812
Person / Time
Site:	Rancho Seco
Issue date:	03/16/1981
From:	Oubre R SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML19350B813	List: 05000312/LER-1981-015, Forwards LER 81-015/04T-0.Event Analysis Submitted 05000312/LER-1981-015-04, /04T-0:on 810214,review of Feb 1981 Effluent Charts Showed Tech Spec for Plant Effluent Ph Was Exceeded. Caused by Effluent Diversion Setpoint Being Slightly out-of-tolerance.Setpoints Lowered
References
NUDOCS 8103230728
Download: ML19350B812 (2)

LER-1981-015, Forwards LER 81-015/04T-0.Event Analysis Submitted

Event date:
Report date:
3121981015R00 - NRC Website

text

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1SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT C 6201 S Street. Bcx 15830. Sacramento. Cahfernia 95813, (916) 452 2211 March 16, 1931 44.,\\. \\.#

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M W2 Mr. R.

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Engelken, Di rector i.

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f-S Pegion V Office of !nspection & Enforcement 1990 North California Boulevard C'7 Walnut Creek Plaza Suite 202 kf

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'fp Walnut Creek, CA 94596 0% e g, VL, > ' -

Re:

Operating License DPR-54 Docket No. 50-312 Reportable CCeurrence El-15

Dear Mr. Engelken:

In accordance with Technical Specifications for Rancho Seco Nuclear Generating Station, Appendix B, Section 5.6.2c, the Sacrarento Municipal Utility District hereby submits the following written eport concerning an Unusual Event which was reported to Mr.

H.

Canter, resident NRC inspector, on March 10, 1981.

A monthly review of plant effluent charts indicated that on Feb rua ry 14, 1931, the Technical Specifications limits for plant effluent pH was exceeded.

Technical Specificaticns, Appendix B, Section 2.4, limits the effluent pH to a minimum 6.5 and maximum 8.5 On the date of the occurrence the effluent chart indicated a momentary increase to a rance of 8.55 - 8.6.

The total time involved was less than 20 minutes.

The date of this occurrence cuincided with tFe time period in which verification of the diversion setpoints and pH alares was being pe r fo rme d.

The verification of the diversion setpoints and aiarms, and subsequent resetting thereo#, was being performed as a result of a similar occurrence during the ~ath of January.

That occurrence was reported to your office via LER 31-05 The corrective action taken as a result of the January occurrence (i.e., lowering the alarm setpoint 0.2 pH units and the diversion setpoint 0,1 pH units below the Technical Specification limit) is adecuate to preclude a similar recurrence.

The latest incident occurred prior to fully implementing the corrective action taken as a result of the January 25, 1981 occurrence.

Since the corrective action is now fully implemented, no further correct!ve action is necessary.

810 8 2 3 0'lgd@>

55 i

AN ELECTRIC $Y5 TEM SERVfNG MORE inA4 50 vC

'N THE xEART Of CAttF0RN4A

Mr. R. H. Engelken 2

March 16, 1o81 Since the plant was shutdown for refuel!,9, there were no plant transients nor power reductions associated with this event.

Respectf ly submitted, 1

1 R. P. Oubre' Piant Superintendent RP0:HH:rm cs:

ICE Washington (30)

MIPC (3)

EPRI-NSAC