ML20086H956

AO 75-26:on 750411,secondary Containment Integrity Breached During Plant Operation.Caused by Disregard for Administrative Procedures.Personnel Informed of Occurrence, Significance & Need for Observing Procedures

ML20086H956
Person / Time
Site:	Peach Bottom
Issue date:	04/21/1975
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A Office of Nuclear Reactor Regulation
References
AO-75-26, NUDOCS 8401200364
Download: ML20086H956 (2)

Text

U .[p PHILADELPHIA ELECTRIC COMPANY 23O1 MARKET STREET PHILADELPHIA, PA.19101 (21518414ooo Apri 1. 21, 1975 Mr. A. Giambusso, Di rector Division of Reactor Licensing Office of fluc1 car Reactor Regulations United States Nuclear Regulatory Corraission Washington, D.C. 20555

Subject:

Abnormal Occurrence The following occurrence was reported to Mr. Eldon Brunner, Region 1, Of fice of Inspection and Enforcement, United States Nucicar Regulatory Commission, on April 12, 1975. Wri tten noti fication was made to Mr. James P. O'Reilly, Director, Of fice of Inspection and Enforcement, Region 1, United States Nuc1 car Regulatory Commission on April 14, 1975. In accordance wi th Section 6.7.2.A of the Technical Specifications, Appendix A of DPR-44 for Unit 2 Peach Bottom Atomic Power Sta tion, the following report is being submitted to the Di rec-torate of Reactor Licensing as an Abnormal Occurrence.

Re ference: License Number DPR-44 Technical Speci fication

Reference:

3.7.C 3

Report No.: 50-277-75-26 Report Date: April 21,1975 Occurrence Date: April 11, 1975 l Facility: Peach Bottom Atomic Power Station R.D. # 1, Del ta, Pennsylvania 17314 Identification of Occurrence:

Breaching of secondary containment integrity during plant ope ra ti on.

Qnditions Prior to Occurrence:

Unit 2 at approximately 100% power.

Description of Occurrence:

During a routine plant inspection, two reactor building doors were foun'd to be blocked open with the interlock switches on the sec-ondary containment doors defeated. n 8401200364 750421 I y$@7 QDRADOCK 05000277 PDR g COPY SENT REGION L ;

C Mr. A. Gicmbusso I 50-277-75-26 April 21, 1975 Page 2 s

Desionation of Apparent Cause of Occurrence:

Individual disregard for Administrative Procedures.

Analysis of Occurrence:

This occurrence caused a secondary containment violation for about a week. During this time interval the unit was operating at full power. Investigation has indicated that wi th the two doors blocked open, the reactor building differential pressure ir maintained nega-tive by the normal ventilation systems. Because the reactor building was held negative during the entire period of time that the two doors were blocked open, all ventilation flow was processed through the reactor building vent stacks. Because the vent stack radiation moni-tors read essentially background levcis during the entire period, no release of ai rbornt radioactivity is associated with the problem.

Further, it is probabic that had the Standby Gas Treatment System been ini tiated wi th the two doors open, the correct negative di fferential pressure would have been maintained. The Standby Gas Treatment System has considerable capaci ty above and beyond that required to maintain reactor building negative with all the secondary containment deors closed.

Corrective Action:

The coors were immediately rcciosed and the interlock switches returned to service. Station supervision in all areas were informed of this occurrence, its significance, and the need for observing Adminis-trative Procedures in a meeting convened by the Station Superintendent for that specific purpose. They were instructed to meet with indi-viduals under their control and to explain and emphasize the problem.

Addi tionally, a wri tten memo was distributed to supervisory plant per-sonnel to reinforce the verbal directions given in the meeting.

Very truly yours,

/

/

r M. . Cooney As t. Gent. Supt.

Generation Division cc: Mr. James P. O 'Rei l l y, Di rector Of fice of Inspection and Enforcement, Region 1 U.S. Nuc1 car Regulatory Commission 631 Park Avenue King of Prussia, PA 19406