ML19319B933
| ML19319B933 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 03/21/1977 |
| From: | Roe L TOLEDO EDISON CO. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001290668 | |
| Download: ML19319B933 (3) | |
Text
NRC Fo M.195 l
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,NRC DISTRIBUTION FOR PART 50 DOCKET MATERI AL DATE OF DOCUMENT FROM: Toledd Edison TO:
John 'i-r Stolz Toledo, Ohio 43652 01 91_77 Lcwell E. Ece DATE RECEIVED no_o2_77 3' GETTER ONOTORIZED PROP INPUT FORM NUMBER OF COPIES RECEIVED CRIGIN AL
' M'NCLASSIFIED
"# ' " Ltr. ref. our 03-15-77 phone conversa tion... Documenting the basis for assurance tha';
mM =anual bypass valves DH21 and DH23 in the t
2 nor=al decay heat re= oval suction line vill no-;
be opened indavertently during Pcwer Operation....
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DONOT REMODNj PLANT NAME: DAVIS ESSE f
jem ACKNOWLEDGED.
SAFETY FOR ACTION /INFORMATION FNvTnn
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TEDESCO ENVIRO ANAINSTS
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BENAROYA DENTON & Mi*fTTR
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T.ATNAR GOSSICK & STAFF ENGINEERING
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TOLEDO EDISON Docket No.
50-346 LOWELL E. ROE Fecd.t.es Deveicornent March 21, 1977 mei ass-sa42 jf Serial No:
242 i
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Director of Nuclear Reactor Regulation
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Light Water Reactors Branch No. 1 C
Division of Project Management M.
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U.S. Nuclear Regulatory Commission K !> :,, Q,, g Washington, D.C.
20555
Dear Mr. Stolz:
As requested by your Staff Reviewer, Mr. G. Mazetis, in a telephone conversation on March 15, 1977 with Mr. E. C. Novak, Toledo Edison Company, General Superintendent, Power Engineering & Construction, this letter documents the basis for our assurance that the manual bypass valves DH21 and DH23 in che nor=al decay heat removal suction line will not be opened inadvertently during power operation. This information is as discussed in a conference call held en February 1, 1977 between the NRC Licensing Project Manager, Mr. Leon EtIgle; NRC Staf f Reviewer, Mr.
G. Mazetis; Toledo Edison Project Engineer, Mr. C. R. Domeck; and Toledo Edison Engineer, Mr. F. R. Miller.
DH21 and DH23 are manually operated 8" gate valves located.inside &
containment vessel and would not be opened inadvertently with the t coolant system pressurized above 280 psig for the following reasons:
1.
No manually operated valves larger than 1-1/2" diameter in. side the containment vessel are required to be operated when the reactor coolant system pressure is greater than 280 psig.
Thus, an operator would not be given instructiocs to enter the containment to open any 8" valves.
2.
All valves are tagged with valve numbers and pipes are labeled.
Valves DH21 and DH23 are locked closed and require a key to open each of them.
3.
Station administrative procedures require that equipment operators have written instructions for operating valves inside the containment. These instructions identify the valves to be operated and give the location of the valve.
THE TOLEDO EDISON CCMPANY EOISON PLAZA 300 MADISON AVENUE TOLEDO. OHIO 43652 N
m e,
e 4.
When the reactor is at power an operator is required to carry a portable radiation survey meter when he enters the contain-ment vessel. If he inadvertently tried to get near valves DH21 and DH23 with the reactor at power he would receive a high radiation alarm as he approached the base of the steam generator and the reactor coolant pumps.
5.
Administrative procedures at the station do not allow mainte-nance personnel to operate valves. Only equipment operators are allowed to open valves during the operation of the station.
Yours very truly, dh e/23-14 e -.
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