ML111530449
| ML111530449 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 06/01/2011 |
| From: | Pilgrim Watch |
| To: | Atomic Safety and Licensing Board Panel |
| SECY RAS | |
| Shared Package | |
| ML111530440 | List: |
| References | |
| RAS 20407, 50-293-LR, ASLBP 06-848-02-LR | |
| Download: ML111530449 (3) | |
Text
I Nov 14 05 )1 :56a Ralph G, Bird Senior VIC! President -
Nuclear SOSIOlll EDISON Pilgrim Nucfear Power Stallon RockV H,II Road Plymouth, MdS",chuse", 02360 U. S. Nuclear Regulatory Comm'sslon Document Control Desk Washington, DC,20555 p.17 BECo 88-126 4\\lgl.lst 18, 1988 License DPR-35 Docket 50-293 REVI~D-lNFORMATI0N REGARDING PILGRIM STATION SAF[TY [NHANC[MENT PROGRAM
Dear Sir:
Enclosed is a description of a revised design for the Direct Torus Vent System (DrVS) that lias described in the "Report on Pilgrim Station Safety Enhancements" dated July I, 19B7 and transmitted to the NRC IIlth Mr. Bird's letter (BECo 87-111) to Mr. Varga dated July 8, 1987.
This revision supersedes In Its entirety the Section 3.2 Included In the July I, 19B7 report.
On March 7, 1988 Boston Edison Company (BECo) personnel met Ijlth Or. Murley.
Mr. Russell, and Or. Thadanl and provided a tour of SEP modifications and an Informal presentation of the quantification of competing risks associated with venting the containment and conclusions drawn from these results. This presentatIon provided BECo the opportunity to respond to questions posed under Item 1 Section 3.2 - "InstallatIon of A DIrect Torus Vent System (DTVS)" In Mr.
Varga's letter to Mr. Bird of August 21. 1987 "Initial Assessment of Pilgrim Safety Enhancement Program".
The materIal presented was made available to the resident inspector and was Included as Attachment II in NRC Inspection Report
- 88-12, dated May 31, 1988.
As you arE aware from plant Inspections we have Installed the DTVS piping and portions of related control Wiring. Currently, the DTVS Is Isolated from the Standby Gas Treatment System (SBGTS) by blind flanges Installed In place of Valve AD-S02S and the DrVS rupture disk. Thh configuration was Inspected by NRR In the performance of a technical review which focused on System, Mechanical DeSign and Structural Design Issues.
The review took place on March 2-3, 1988 as documented In NRC Inspection Report #88-07. dated Hay 6. 1988 and determined the Installation configuration to be acceptable.
He now plan to remove these blind flanges and proceed with installation of Valve A0-5025 and
.the OTVS rupture disk.
~e conclude the valve and rupture disk provide eQuivalent physical Isolation of the OTVS piping from the SBGTS and appropriately ensure the operational Integrity of the SBGTS under design basis accident conditions.
Following completIon of this work, we will perform a local leak rate test to verify that Valve AD-S02S Is acceptably leak tight using the same method previously utilized In testing the blind flange.
He also plan to complete all remaIning electrIcal wor~ on the DTVS In accordance with Ab6{
the revised design.
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Nov 14 05 11 :56a p.18 I
I BOSTON EDISON OOMP~
August 18. 1988-
. U.S. Nuclear Regulatory Commission Page 2 On the basis of the revised Section 3.2, we conclude that the DTVS design as described In the enclosure does not require any change to the Technical Specifications and that we can proceed with Installation without prior NRC \\
approval.
Please feel free to contact me or Mr. J. E. Howard, of my staff at (617) 849-8900 If you have any Questions pertaining to the design details of the DTVS.
~~
R. G. Bird
Attachment:
Section 3.2 Revision 1 Mlnstallatlon Of A Direct Torus Vent System (OTVS)"
JEH/amm/2282 cc:
Mr. D. McDonald, Project Manager Division of Reactor Projects 1/11 Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mall Station PI-137 Washington, D.C.
20555 U. S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406 Senior NRC Resident Inspector Pilgrim Nuclear Power Station
p.19 Nov 14 05 11 :57a
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