05000361/LER-1982-014, Forwards LER 82-014/01T-0.Detailed Event Analysis Submitted

Forwards LER 82-014/01T-0.Detailed Event Analysis Submitted

ML20054G143
Person / Time
Site:	San Onofre
Issue date:	06/11/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20054G144	List: 05000361/LER-1982-014, Forwards LER 82-014/01T-0.Detailed Event Analysis Submitted 05000361/LER-1982-014-01, /01T-0:on 820604,insp Revealed Number of Refractory Blanket to Fire Barrier Joint Seals Did Not Have Mastic Coating Applied.Caused by Incomplete Installation & Inadequate Installation Insp
References
NUDOCS 8206210164
Download: ML20054G143 (4)

LER-1982-014, Forwards LER 82-014/01T-0.Detailed Event Analysis Submitted

Event date:
Report date:
3611982014R00 - NRC Website

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U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Revion V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5328 Attention: Mr. R. H. Engelken, Regional Administrator

Dear Sir:

Subject: Special Report Regarding Inoperable Fire Rated Assemblies and Sealing Devices Docket No. 50-361 San Onofre Nuclear Generating Station, Unit 2

Reference:

(a) Letter, H.B. Ray to R.H. Engelken dated May 14, 1982, same subject (b) Letter, H.B. Ray to R.H. Engelken dated June 7,1982, (LER 82-014)

This letter updates the Special Report of reference (a) and includes in the attached chart an illustration of Fire Barrier Penetration seal activity since May 14, 1982.

The following summarizes the net changes in the 27 days since the reference (a) report:

Item

Description

Total s 5/13/82 6/4/82 6/10/82 1.

Total number of seals inoperable and requiring fire watches:

1,188 242 41 0 2.

Total number of seals restored and considered operable by contractor QC:

1,073 1 54 244 3.

Total number of seals physically inoperable:

115 88 166 pg 4.

Total number of seals physically inoperable for a period of less than seven (7) days:

29 31 110 8206210164 820611 PDR ADOCK 05000 S

Mr. R. H. Engelk:n Juna 11,1982 1

Item

Description

Totals 5/13/82 6/4/82 6/10/82 Total number of seals physically (7) 5.

inoperable for a period of seven days or more:

86 57 56 6.

Total number of seals physically inoperable for a period of thirty (30) days or more:

24 12 13 7.

Unit 2 physically inoperable seals:

14 7

74 8.

Unit 2 & 3 common barriers - physically inoperable seals:

1 01 81 92 The large decrease in categories one (1) and two (2) above represents the increased effort applied by Station Maintenance and QA personnel to performing the final inspections and acceptance of fire barrier pene-tration seals previously accepted by the contractor's QA organization.

Though seals in categories (1) and (2) are maintained under the surveil-lance of fire watches as explained in the Reference (a) report, they are not shown on the enclosed trending plot for reasons of clarity.

On June 4,1982, an engineering evalJation of the results of a QA inspection of cable tray penetrations of fire barriers in various in-accessable locations of Unit 2 and areas common to both Units 2 and 3, determined that a number of refractory blanket to fire barrier joints had not been sealed with a mastic compound as required by construction specifications. These seals, therefore, were declared " inoperable" in accordance with Technical Specification LC0 3.7.9.

Though the results of this evaluation were immediately made known to the Station Emergency Preparedness organization managing existing fire watches, the assignment of additional fire watches as required by Action Statement 3.7.9.(a) could not be accomplished within one hour because of the large number of seals involved (119).

This situation was, therefore, promptly reported to your office by telephone in accordance with Technical Specification Section 6.9.1.12.b on the afternoon of June 4,1982.

Fire detectors in the affected areas were confirmed to be operable and adequate fire watches were established within approximately 1-1/2 hours.

Corrective action to apply the required mastic coating was commenced immediately on these additional seals and priority is being placed on their restoration.

The effect on our progress of these 119 additional inoperable fire barrier penetration seals is illustrated by the seal status totals shown above as well as in the applicable trend plots attached.

The delay in indicating the additional seals on the trend plot is attributed to the administrative processing and approvals of control forms for each penetration seal.

Mr. R. H. Engalken June 11,1982 As stated in the confirmation letter of Reference (b), this report is considered as the 14-day follow-up report required by specification 6.9.1.12 and a completed Licensee Event Report form for LER 82-014 is attached.

Our next Special Report update will be made on July 9,1982, and will provide Fire Barrier Penetration status through July 8,1982.

If there are any questions regarding the above, please contact me.

Sincerely, t

l l

Enclosure cc:

A.E. Chaffee (USNRC Resident Inspector, San Onofre, Unit 2) l l

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