ML19262A367
| ML19262A367 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/19/1975 |
| From: | Lear G Office of Nuclear Reactor Regulation |
| To: | Arnold R METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7910260688 | |
| Download: ML19262A367 (2) | |
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NRC POR Local POR N ier ER 13 W5 TJCarter Docket No. 50-289 GLear DJaffe Metropolitan Edison Company SATeets ATTN: Mr. R. C. Arnold OELD Vice President 0I&E (3)
P. O. Box 542 ACRS (14)
Reading, Pennsylvania 19603 Gray file 5 extra copies Gentlemen:
During the period September 5,1974 to January 24, 1975, we have noted an unusually high incidence of unplanned radioactive gas releases at Three Mile Island Unit I.
These gases have been released through the ventilation system following the ejection of the fluid (water) in loop seals on various components associated with the plant vent header.
In the enclosure to your Nonroutine ;0-Day Report 74-01, dated October 3,1974, you indicated that the blowing of loop seals was due to inadequate design in that the as-built plant vent header system is not capable of handling nomal operating pressure transients. You also advised us that your Plant Operating Review Comittee had recomended that preventive action be taken to redesign and modify ~the loop seal piping and valve system.
Please advise us of your plan and current effort to modify the loop seal piping and valve system.
In this regard, within 30 days following receipt of this letter, please provide us with your schedule for completion of your design study and subsequent modification and testing of the system. Moreover, please provide appropriate modification of existing technical specifications that would prevent unplanned radioactive releases from the plant vent header. These technical specifications would be applicable until completion and subsequent testing of the modified system.
Sincerely.
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{p George Lear, Chief Operating Reactors Branch #3 Division of Reactor Licensing ccs: See page 2 1485 225 0.RB,d
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G. F. Trowbridge, Esquire Shaw, Pittman, Potts, Trowbridge & Madden Barr Building 910 17th Street, N. W.
Washington, D. C. 20006 GPU Service Corporation Richard W. Heward, Project Manager Thomas M. Crimins, Jr., Safety and Licensing Manager 260 Cherry Hill Road Parsippany, New Jersey 07054 Pennsylvania Electric Company Vice President, Technical 1001 Broad Street Johnstown, Pennsylvania 15907 Mr. Weldon B. Archart, Chairman Board of Supervisors of Londonberry Township 2148 Foxiana Road Middletown, Pennsylvania 17057 Miss Mary V. Southard, Chairman Citizens For A Safe Environment P. O. Box 405 Harrisburg, Pennsylvania 17108 Government Publications Section State Library of Pennsylvania Box 1601 (Education Building)
Harrisburg, Pennsylvania 17126 1485 226 OFPtC E W sum =aua
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Forze AIC.318 (Rev. 9 5)) AECM 0240
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