ML19256D059
| ML19256D059 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 11/06/1975 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Heineman R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19256D060 | List: |
| References | |
| ORB-4-29, NUDOCS 7910160783 | |
| Download: ML19256D059 (1) | |
Text
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Robert E. Heineman, Directo:, Division of Technical Reriew TECHNICAL ASSISTANCE REQUEST NO. ORS-. -29
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U Your assistance is requested in the following:
PLANT NAME: Three Mile Island Unit 1 (TMI-1)
DOCKET NO.,.
50-289 RESPOSSIBLE'ER/GCH:
O erating Reactors Branch 4 (ORE 4)
P CONTACT:
D. N. Bridges (phone 7435)
TECILNICAL REVIEW BRANCHES: Accident Analysis Branch Containment Systems Branch TARGET COMPLETION DATE:
January 15, 3976
~DESCRIPTICN OF REQUEST:
Attached is a reanalysis of the D1?.-l Reactor Building.
Spray Systec performance.
Th a reanalysis was requested by the NRC.
NRC (0IE) has been advised recently by B&W that the development of recent analytical techniques for evaluating this system had led to the' conclusion that some, B&W plants may be operating with systems with performance characteristics not consistent with those assured a the FSAR.
One specific concern raised was the potential fer mis =atched drawdowns between the Borated Uater Storage Tank, the Sodium Thiosulfate Tank, and the Sodium Hydroxide Tank which could cause reduced rates of iodine removal during certain time periods of the system operation.
The reanalysis by TMI-1 Has been done using the B&W computer' program and certain conservatis=s.
Likewise, the computer program has been verified at TMI-l under at least one condition (during start-up testing).
Please review the attached submittal to determine if the D11-1 Reactor Building Spray System characteristics conform to "RC requirecents. You are also requested to provide us with a written evaluation'of your findings.
l5 f j] h[u ()
Robert W. Reid, hief p,
Operating Reactors Branch 4
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Division of Rex.cor Licensing cc:
DBridges RWReid RIngram DEisenhut KRGoller Accident Analysis Branch
. TJCarter Containment Systems Branch 4910160
/b/-(h O' h DISTRIBITTION y y Docket RWRaid KRGoller G.*I[ ]Y: ORB 4 Reading RIngram DEisenhut RL:0RB4 0RB4 TJCarter SVarga DBridges/BK RWReid / 11/f/75 11/t/75 .}}