05000311/LER-1982-075, Forwards LER 82-075/01T-0.Detailed Event Analysis Encl

Forwards LER 82-075/01T-0.Detailed Event Analysis Encl

ML20063F135
Person / Time
Site:	Salem
Issue date:	08/18/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20063F139	List: 05000311/LER-1982-075, Forwards LER 82-075/01T-0.Detailed Event Analysis Encl 05000311/LER-1982-075-01, /01T-0:on 820814,1 Gpm Svc Water Leak Discovered on Containment Fan Coil Unit 22.Cause Not Stated.On 820815, Similar Leak Discovered on Unit 24.Unit 22 Repaired by Blanking Flanges in Svc Water Piping to Coil
References
NUDOCS 8208310150
Download: ML20063F135 (4)

LER-1982-075, Forwards LER 82-075/01T-0.Detailed Event Analysis Encl

Event date:
Report date:
3111982075R00 - NRC Website

text

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O PSIEG Public Service Electric and Gas Company P.O. Box E Hancockr Bridge, New Jersey 08038 Salem Generating Station August 18, 1982 Mr.

R.

C.

Haynes Regional Administrator USNRC i

Region 1 631 Park Avenue King of Prussia, Pennsylvania 1940C

Dear Mr. Haynes:

LICENSE NO. DPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 82-075/0lT Pursuant to the requirements of Salem Generating Station Unit No.

2, Technical Specifications, Section 6.9.1.8.c, we are submitting Licensee Event Report for Reportable Occurrence 82-075/0lT.

This report is required within fourteen (14) days of the occurrence.

Sincerely yours, lw

/l s

H.

J.

Midura General Manager -

Salem Operations RF:ks.f[

CC:

Distribution 8208310150 820818

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DR ADOCK 05000311 PDR The Energy People

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manuvaon

I Report Number:

82-075/0lT Report Date:

08-18-82 Occurrence Date:

08-14-82 Facility:

Salem Generating Station, Unit 2 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Containment Service Water Leak - Nos. 22 and 24 -

Containment Fan Coil Units.

This report was initiated by Incident Reports82-216 and 82-217.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 82% - Unit Load 900 MWe.

DESCRIPTION OF OCCURRENCE:

At 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br />, August 14, 1982, during a visual inspection of the Containment Building, an operator discovered a 1 GPM service water leak from a cooling coil on No. 22 Containment Fan Coil Unit (CFCU).

At the time of discovery, No. 25 CFCU was i. operable due to a failed cooling coil, and Technical Specification Action Statement 3.6.2.3.a was in effect.

No. 22 CFCU was also declared inoperable, and Action Statement 3.6.2.3.b was entered.

Service water to the unit was immediately isolated, and prompt notification to the NRC was made.

No. 25 CFCU was repaired, and was declared operable at 1750 hours0.0203 days <br />0.486 hours <br />0.00289 weeks <br />6.65875e-4 months <br />, August 14, 1982.

Action Statement 3.6.2.3.b was terminated; however, with No. 22 CFCU still inoperable, Action Statement 3.6.2.3.a remained in effect.

At 1055 hours0.0122 days <br />0.293 hours <br />0.00174 weeks <br />4.014275e-4 months <br />, August 15, 1982, during a similar inspection, an operator discovered a 1 GPM leak from No. 24 CFCU.

The unit was declared inoperable, but since the unit is in the same group as No. 22 CFCU, Action Statement 3.6.2.3.b did not apply.

Service water to the unit was immediately isolated, and prompt notification was performed.

Written confirmation of both incidents was transmitted on August 16, 1982, the next working day after the occurrences.

Both containment spray systems were operable throughout the occurrences.

LER 82-075/0lT.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Investigation of the problem in both cases showed that the leakage was from the cooling coils.

The coils are fabricated from copper-nickel alloy which is susceptible to erosion by silt particles in the service water.

Similar failures of other CFCU's have been noted, with most leaks occurring at bends where erosion is more significant.

Corrosion involving dissimilar metals in the service water piping may also be involved.

ANALYSIS OF OCCURRENCE:

Primary containment is a design feature which ensures that the release of radioactive materials in the event of accident conditions will be restricted such that site boundary radiation doses will be within the limits of 10CFR100.

NRC IE Bulletin 80-24 requires that any service water leak inside the contain-ment be considered as a degradation of the containment boundary.

If containment pressure increased to the design pressure of 47 psig during an accident, there is a possibility of the release of radioactivity through the service water discharge.

The

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occurrences therefore constituted abnormal degradation of the primary containment and are reportable in accordance with Technical Specification 6.9.1.8.c.

The CFCU's operate in conjunction with the containment spray systems to remove heat and radioactive contamination from the containment atmosphere in the event of a design basis accident.

Operability of either all fan coil groups or of both containment spray systems is necessary to ensure offsite radiation dose is maintained within the limits of 10CFR100.

Because in both cases the leakage was immediately isolated, containment integrity was maintained.

Redundant containment cooling capability was provided by the containment spray systems.

The occurrences therefore involved no risk to the health or safety of the public.

Due to the inoperability of the CFCU's, the event constituted operation in a degraded mode permitted by a limiting condition for operation.

Action Statement 3.6.2.3.a requires:

With one group of containment cooling fans inoperable, restore the inoperable group of cooling fans to operable status within the next 7 days, or be in hot standby l

within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in cold shutdown within the I

following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

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LER 82-075/0lT.

ANALYSIS OF OCCURRENCE:Action Statement 3.6.2.3.b requires:

With two groups of containment cooling fans inoperable, restore at least one group of cooling fans to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, or be in at least hot standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in cold shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

CORRECTIVE ACTION

As noted, Action Statement 3.6.2.3.b was terminated with the repair of No. 25 CFCU.

In the cases of No. 22 and 24 CFCU's, leakage was immediately isolated, and prompt notification was performed in accordance with Technical Specification 6.9.1.8.

The leaky cooling coil on No. 22 CFCU was isolated by blanking the flanges in the service water piping.

The unit was satis-factorily tested and declared operable.

Action Statement 3.6.2.3.a remained in effect, however, since No. 24 CFCU was still inoperable.

The failed coil on the unit was repaired utilizing Belzona metal filler and was tested satisfactorily.

No. 24 CFCU was declared operable, and at 0250 hours0.00289 days <br />0.0694 hours <br />4.133598e-4 weeks <br />9.5125e-5 months <br />, August 16, 1982, Action Statement 3.6.2.3.a was terminated.

Design Change Request 2EC-0505 has been issued to replace the CFCU cooling coils with coils manufactured of AL-6X steel, for

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improved erosion and corrosion resistance in the service water environment.

This change is scheduled for implementation during the next refueling outage.

A commitment to submit a Supplemental Report upon completion was made in LER 82-070/0lT.

FAILURE DATA:

Containment service water leaks due to erosion of Service Water System components on CFCU's have occurred 7 times since January 1, 1982.

l l

[

Westinghouse Electric Corporation I

Containment Fan Coil Unit U-Tube Cooling Coil Prepared By R.

Frahm 4

ex <s General' Manhger -

Salem Operations SORC Meeting No.

82-77 r

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