ML19326A264
| ML19326A264 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 03/10/1978 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Roe L TOLEDO EDISON CO. |
| Shared Package | |
| ML19326A262 | List: |
| References | |
| NUDOCS 8002030124 | |
| Download: ML19326A264 (2) | |
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MA% 10.1979 ket File RIngram Docket No. 50-346
- LWR 1 File
'GVissing-NRC PDR
'RBoyd LPDR
.RDeYoung IE.(3) 1 LCrocker Toleco Edison Company ATTN: Mr. Lowell E. Roe OELD DVassallo Sto k.
JKnight Vice President Rftartin n -RBosnak Facilities Development' *
. EHyl ton-u-
'4, 300 Madison Avenue -
-> ' ' C HSmith Toledo, Ohio '43652 FWilliams
, bcc: ACRS (16)
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sNSIC Gentlemen:
l RReid TIC SulMECT:' PW REACTOR VESSEL SEAL-RING MISSILE PROBLEM DAVIS-BESSE NUCLEAR POWER STATION, UNIT 1 During the course of responding-to the staff's review of an application for license amendment on the Trojan Nuclear Plant, the licensee informed the NRC that the reactor cavity annulus seal ring (used as a water seal during refueling operations, and not removed during nomal operations) and associated biological shielding ove'r the reactor vessel cavity could become missiles in the event of a loss of coolant accident (LOCA) pipe break inside the reactor vessel cavity.,At the Trojan Nuclear Plant, s
these missiles could affect the ability of the control rods to shut down the reactor.- From our preliminary evaluation of the 1' formation provided to the NRC staff by the licensee, the Portland General Electric Cosoany.
and by Westinghouse, Combustion Engineering, Babcock & Wilcox and Bechtel in telephone discussions on January 25'and 26,1978, it appears that this problem could occur in other PR facilities such as yours and could potentially pose a threat to the health and safety of the public in the event of a LOCA.
Therefore, you are hereby requested to deliver to the Office of Nuclear Reactor Regulation, Nuclear Regulatory Commission, Washington,'D. C.,
~20555, within 20 days of the date of this letter, the following infoma-
-tion: (a) a statement as to whether the cavity annulus seal ring in your facility is left in place during normal operation or if biological shielding is installed in the reactor cavity; annulus and, if the answer Nto [a) is yes; (b) when yon will detersimelwhether the cavity annulus.-
. seal ring or biological shielding comid haceae a missile in your~ facility, uand (c) a description of what'you plan te;de,;and whes rif the: problem
- 21slfound at your facility and (d).Justificatterte-support why continued te the healtkand safety of.the.
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o Toledo Edison Ccapany cc: Donald H. Hauser, Esq.
Cleveland Electric Illuninating Company P. O. Box 5000 Cleveland, Chio 44101 Gerald Charnoff, Esq.
Shaw, Pittraan, Potts & Troweridge 1800 M Street, N.W.
Washington, D. C.
20036 IAs11e Henry, Esq.
Fuller, Seney, Henry & Hodge 300 Madison Avenue Toledo, Onio 43604 b
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