ML19256D661
| ML19256D661 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/22/1976 |
| From: | Baer R Office of Nuclear Reactor Regulation |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7910220573 | |
| Download: ML19256D661 (2) | |
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t SEP 2 21976 Docket No. 50-289 MEMORANDUM FOR:
R. Reid, Chief,,0perating. Reactors Branch 4, D0R FROM:
R. Baer, Chief, Reactor Safety Branch, D0R.
SUBJECT:
THREE MILE ISLAND. TECH. SPEC CHANGE NO. 36 PLANT NAME: Three Mile Island.. Unit.l......
DOCKET NO.: 50-289 OPERATING TECHNOLOGY B'(ANCH:., Reactor Safety............
REVIEW STATUS: Ongofag July 7,1976, Metrc colitan Edison requested a Tech Spec change (No. 36) for Three Mile Islaad Unit 1..
The change.was to. remove the open vent valve penalty under which B&W reactors must operate, plus new pressure temperature core protection 1.imits. curves... Release.fran the vent valve.
penalty was indicated as' necessary.to. offset an. error _in DNBR..
calculations due to improper. incorporation.of the. penalty for densification.
In conversations on SeptemberT17,.1976.wkth, representatives of B&W regarding thermal margins available.to. offset fiel. rod bowing penalties it was brought out.that. approval of the TMI. Tech Spec ' hange c
would create problems for rod bowing..The proposed Tech Specs take full credit for the vent valve. penalty.in the pressure-temperature core protection curves (Figures 2.1-1, 2.1 3, and 2.3-1).. The B&W personnel pointed out that if a portion (4%) of the 11.5% themal margin due to the vent valve. penalty is used to offset the densification error and the present core protection curves are used then the remaining 7.5% themal margin will be.available to offset rod bowing penalties. Use of the proposed. Tech. Specs with the new curves would necessitate restricted operation.of.TMI when the rod bowing penalties are irposed.
Based on the above infomation we.recocnend that the proposed Tech Scec change (No. 36) not be. approved.in.its. entirety. At the present granting release fran the open vent valve penalty would be advisable. However, approval of curves defining new curve protection limits would not be advisable until the effect of rod bowing is resolved.
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~ Ori;;inal signed by, Eobert Baer l
Robert Baer, Chief M..
Reactor Safety Branch Division of Operating Reactors.
1452 294 7910220 E73
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