05000267/LER-1981-045, Forwards LER 81-045/03L-0.Detailed Event Analysis Encl

Forwards LER 81-045/03L-0.Detailed Event Analysis Encl

ML20010G152
Person / Time
Site:	Fort Saint Vrain
Issue date:	08/26/1981
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20010G153	List: 05000267/LER-1981-045, Forwards LER 81-045/03L-0.Detailed Event Analysis Encl 05000267/LER-1981-045-03, /03L-0:on 810727,during Normal Startup Operation, Primary Coolant Dewpoint Exceeded Tech Spec Limits.Caused by Contamination Due to Moisture.Contaminants Removed from Primary Coolant
References
P-81210, NUDOCS 8109150387
Download: ML20010G152 (4)

LER-1981-045, Forwards LER 81-045/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2671981045R00 - NRC Website

text

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L E.f public Service Company *f CoHondo 16805 ROA919%

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PLATTEVILLE, COLOR ADO 80651 Augus t 26, 1981 Fort S t. Vrai n 1 I r Q, /

Unit No. 1 68 g

P-81210 g\\

f (S &( p' e t,1

=o Mr. Karl V. Scyfrit, Directc,r

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Nuclear Regu'.atory Commission d

Region IV Office of Inspection and Enforcement

%A l u 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012 Re fe rence : Facility Operating License No. DF R-34 Docket No. 50-26 7

Dear Mr. Seyfrit:

Enclosed please find a coay of Reportable Occurrence Report No. 50-267/

81-045, Final,. submitted per the requirements of Technical Sper ' fication AC 7.5.2(b)2.

Alsa, phase find enclosed one copy of the Licensee Event Report for Reportable Occurrence Repcrt No. 50 467/81-045.

I Very truly yours,

N 'L' 4.t %'

Lon Warembourg

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Manager, f aclear Production Dil/cis En clos ure c.c :

Director, MIPC Th s

1I 8109150387 010826 PDR ADOCK 05000267 S

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i REPCRT DATE:

Aucust 26. 1981 AEPORTABLE OCCURRENCE 81-045 ISSUE 0 CCCURRENCE DATE:

July 27, 1981 Page 1 of 3 j

FORT ST. VRAIN LEAR GENERATING STATION i

PUBLIC SERV.c CCMPANY OF COLORADO 16805 WELD COUNTY ROA0 19 1/2 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/81-045/03-L-0 Final i

IDENTIFICATION OF OCCURRENCE:

i i

During normal startup operations, the primary coolant dewpoint exceeded the limits of Figure 4.2.11-1.

This is recortable as a cegraded mode of LCO 4.2.11 per Fort St.

Vrain Technical Specification AC 7.5.2(o12.

EVENT

DESCRIPTION

3 During the reactor refueling period,,the primary coolant became j

contaminated with moisture.

During the subsequent startup, the rise-to power was delayed while the purification system was used to clean up the primarv coolant.

Each increase in power level and average core outist temperature results in additional out gassing of moisture from the griphite of the core and the insulation of the prestressed concrete reactor vessel causing a temporary increase in moisture. The reactor power was raised in steps with a pause after each step to allow the purification system to remove the moisture.

On July 27, 1981, after a oower incraase, the moistuce lavel measured by cewpoint increased past the limit of LCO 4.2.11.

By 1300 hours0.015 days <br />0.361 hours <br />0.00215 weeks <br />4.9465e-4 months <br /> on l-July 28, 1981, the dewpoint was back in the limited acceptable region of LCO 4.2.11, where operation continued until the end of the month.

CAUSE

DESCRIPTION:

The excessive moisture entered the primary coolant curing the i

refueling period while the reactor was kept subatmospheric for refueling and maintenance purposes. Also, the new fuel mey have had some moisture abso-bed which was ofi gassed when the core started to j

heat up.

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REPORTABLE OCCURRENCE 81-045 ISSUE O Page 2 of 3 CORRECTIVE ACTION:

The purification train was coerated to remove the impurities from the primary coolant.

No other corrective action is anticipated or required.

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REPORTABLE OCCURRENCE 81-045 I

ISSUE O Page 3 of 3 i

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Prepared By:

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% /r i-Asa B. Reed Technical Services Technician i

Reviewed By:

M 'PV).dde.,

Mill McBride Technical Services Manager t

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Reviewed By:

(( /d4/ -[ M Edwin D. Hill

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Station Manager Approved By:

A Don Waremocurg

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Manager, Nuclear Production a

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