ML20086G272

AO 75-78:on 751226,drywell Radiation Monitor Inoperative. Caused by Flow Blockage in on Stream Sample Line.Sample Point Changed to Reestablish Sample Flow to Drywell Radiation Monitor

ML20086G272
Person / Time
Site:	Peach Bottom
Issue date:	01/05/1976
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Stello V Office of Nuclear Reactor Regulation
References
AO-75-78, NUDOCS 8401100501
Download: ML20086G272 (2)

Text

• !

o o -

ge m" i

PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET l e "fN. \

PHILADELPHIA. PA.19101 p 2

a s si e4i-4ooo fBJ et % y(,

~ -fr cc %

January 5,1976 -

U f5- Q 2 8 G5 K'~ l-l L.,'

E g N~~; .h!

Mr. Victor Stc11o, Jr. N /

Director I

[~ # e J [

~

Divi sion of Operating Reactors Office of Nuclear Reactor Regulations

~

United States Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

Abnormal Occurrence The following occurrence was reported to Mr. Elden Brunner, Region 1, Of fice of Inspection and Enforcement, Uni ted States Nuclear Regulatory Commission, on December 26, 1975 Wri tten notification was made to Mr. James P. O'Reilly, Of fice of Inspection and Enforcement, Region 1, Un .ad States Nuclear Regulatory Commission on December 26, 1975 In accordance wi th Section 6.7 2.A of the Technical Specifications, Appendix A of DPR-56 for Unit 3 Peach Bottom Atomic Power Station, the following report is being submitted to the Directorate of Reactor Licensing as an Abnormal Occurrence.

Reference:

License Number DPR-56 Technical Specification

Reference:

3.6.C.2 Report No.: 50-278-75-7E Report Date: 1- 5-76 Occurrence Date: 12-26-75 Faci li ty: Pea'ch Bottom Atomic Power Station - Unit 3 RD #1, Delta, Pennsylvania 17314 Identification of Occurrence:

Drywell Radiation Monitor inoperative.

Conditions Prior to Occurrence:

thi t 3 at approximately 50% power.

Description of Occurrence:

During a routino plant ins?cction it was observed that no sampic flow was passing through the Drywell Radiation Monitoring System.

0401100501 760105 PDR ADOCK 05000277 ' IQ S _PDR u f COPY SENT REGION _

Mr. Victor Stello O -

O50-278-75-78 -

January 5, 1975 Page 2 4

Designation of Apparent Cause of Occurrence:

Flow blockage in the on stream sampic line (one of seven availabic sampic lines). .

i Analysis of Occurrence!

The flow blockage occurred in only one of the seven availabic sampic points and although there was temporarily no flow through the Drywell Radiation Monitor, it was still capable of operation with any I of the remaining 6 (six) sample points. When flow was re-established' l via one of the available 6 points, drywell radiation levels were as '

expected. In addition, the Drywell Floor Drain Sump remained operabic through out this period with the indicated flow normal. Therefore, r the safety implications of this occurrence are minimal.

Corrective Action:

The sampic point was changed to another point to re-establish 3 sample flow to the Drywell Radiation Monitor. Corrective action awaits l an appropriate opportunity.

1 Failure Data:

Similar occurrences were reported as Abnormal 0ccurrence Reports 50-278-75-65 and 50-278-75-74.

i

Very truly yours,

]

c.

M. .-Cooney S erintendent Generation. Division - Nucicar

, cc: Mr. J. P. O'Reilly

, Director, Region 1 Office of Inspection and Enforcement U.S. Nucicar Regulatory Commission j 631 Park Avenuc-

! King of Prussia, PA ?t9406 i

1 1

J

- - , . -