ML19319B927
| ML19319B927 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 03/02/1977 |
| From: | Roe L TOLEDO EDISON CO. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001290663 | |
| Download: ML19319B927 (2) | |
Text
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U.S. NUCLE A R REGULATO',1Y CC'
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NR,C DISTRIBUTION FoR PART 50 DOCKET MATERI AL FROM:
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TO:
Mr J PStdl2 Toldco Edison Co
""*i-T-77 Toldeo, Ohio L E Roe DATE RECEIVED 3 4 77 CLETTER ONOTORIZED PROP INPUT FORM NUMBER OF COPIES RECElVED
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DESCRIPTION ENCLOSURE Ltr furnishing info Concerning ope. 2bility of the Containment vessel pressure t ansmitters under the worst postulated enviro Conditionr ACItv~m
.t_D rm 1p DO NOT RBIOVE PLANT NAME:
Davis Besse 11 ehf 7
SAFETY FOR ACTION /INFORMATION FWTon 3-10-77 I
/ ASSIGNED AD:
/4 Sse // O [L M AssTcwn An.
J3MCH CHIEF!
SyoIL nuNcn enTv;.
I l]LOJ_ECT MANAGER:
EM9/f PROJECT MANAGER:
I Mjlfen LIC. ASST. ;
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INTERNAL DISTRIBUTION 1
MG FIL]D SYSTEMS SAFETY PLANT SYSTEMS SITE SAFETY &
/ NRC PDR HEINEMAN
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TED_ESCO [LfN ENVIRO ANALYSTS I
/ I & E (2.)
SCHR9EDER
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BENAROYA DENTON & ?n'T TSR OELD
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T A TNAM GOSSICK & STAFF ENGINEERING
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IPPOLITO ENVIRO TECF-MIPC MACARRY KIILiGTOCD ERNST J
CASE
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BOS!nK BALLARD HANAUER
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SIWEIL OPERATING REACTORS SPANGLER I
HARLESS
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PA*JLICKI STELLO I
SITE TEC"-
PROJECT MANAGEMENT REACTOR SAFETY OPERATING TECH.
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ROSS (th.)
EISENHUT STEPP
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NOVAK SHA0 HULMAN
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ROSZTOCZY BAER PETERSON
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CHECK
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March 2, 1977
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Serial No. 229
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Attn:
Mr. John F. Stolz, Chief f-b 7,'
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G Division of Project Management U.S. Nuclear Regulatory Commission s,,
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Washington, D.C.
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Dear Mr. Stolz:
Paragraph 3.11.2.2.4 in the Davis-Besse Nuclear Power Station Unit 1 FSAR has lead to confusion concerning the operability of the containment vessel pressure transmitters under the worst postulated environmental conditions. This paragraph of the FSAR will be revised for clarification to read as follows:
426, 500 The transmitters are located in separate rooms (Rooms 4046 and 501) and are designed to function for 40 years at 120 F temper-ature and 1007. humidity, the worst postulated environmental condi-tions expected in the auxiliary building except for Room 404. As shown in Table 3-6aa under the discussion of protection against environmental effects outside the containment "essel, Room 404 could rise to 213 F due to a postulated steam line to the auxiliary feedpump turbine or the main f eedwater line break in that room.
These postulated breaks would not pressurize the containment vessel and the containment vessel pressure transmitters would not be 4 tired to function for this event. The transmitters have seismic qualification reports on file and are all manufacturered with enclosures qualified for 300 F and 60 psig for one hour and 244 F and 20 psig for the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
The above clarification should alleviate any concerns abcat the operability the containment vessel pressure transmitters under their respective environmental conditions.
Very truly yours, 2576 Enclosures bj d/10 THE TCLEDO EC2 SON COMPANY EDISCN PLAZA 300 MADISON AVENUE TCLECO. CHIO 43652