ML20072H151

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Forwards Rev 1 to Improved Dynamic Vacuum Breaker Valve Response for Peach Bottom, Per Generic Ltr 83-08.Wetwell/ Drywell Vacuum Breakers Will Perform Design Function W/O Further Mod
ML20072H151
Person / Time
Site: Peach Bottom  Constellation icon.png
Issue date: 03/25/1983
From: Kemper J
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: Eisenhut D
Office of Nuclear Reactor Regulation
Shared Package
ML20072H155 List:
References
GL-83-08, GL-83-8, NUDOCS 8303290303
Download: ML20072H151 (1)


Text

N y ..

PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 1881 -1981 PHILADELPHI A. PA.19101 1215) 841-4 5 o 2 vicE PRESIDENT E ntf. east s stepeQ AseO 6dE SE AstCM Mr. Darrell G. Eisenhut, Director Docket Nos. 50-277 Division of Licensing 50-278 Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission

'Vashington, DC 20555

Subject:

Peach Bottom Atomic Power Station, Units 2 6 3 Modification of Vacuum Breakers on Mark I Containments

Reference:

Generic Letter 83 Darrell G. Eisenhut to Distribution dated 2/2/83 File: GOVT 1-1 (NRC)

Dear Mr. Eisenhut:

As a result of damage observed to certain components of the GPE wetwell/drywell vacuum breakers during the Mark I Containment full scale flow tests, Bh'R owners with GPE vacuum breakers formed a group to study the problem.

As a first step toward resolution, General Electric Company issued SIL 321 which recommended certain actions that would increase the reliability of the vacuum breakers. These recommendations were implemented at Peach Bottom during 1980 and 1981.

As a second 3tep, Nutech was retained by the Owners to investigate / define the cause of the damage and to recommend corrective actions to be taken.

Nutech, with the consulting support of Continuum Dynamics, Inc. , completed their investigation in mid-1982. In October, 1982, a Peach Bottom unique report was prepared by Continuum Dynamics which concluded that the wetwell/drywell vacuum breaker disc would not actuate during the chugging transients. A copy of the report is attached.

l On the basis of the conclusions of the report, it is our position that the wetwell/drywell vacuum breakers at Peach Bottom will perform their design function without further modification.

Sincerely, [

pn C303290303 830325 PDR ADOCK 05000277 P PDR