ML20236H629
| ML20236H629 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/30/1987 |
| From: | Shelton D TOLEDO EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 1396, IEIN-86-079, IEIN-86-79, NUDOCS 8708050273 | |
| Download: ML20236H629 (3) | |
Text
--
o TOLEDO
%msEDISON DONALD C. SHELTON.
Vce Presdent-Nuchar (419] P49 2399 l-Docket No. 50-396 j
l License No. NPF-3 Serial No. 1396 July 30, 1987 United States Nuclear Regulatory Commission
~
Document Contro1 Desk Washington, D. C.
20555 Gentlemen:
Questions 6 and 26 of NRC letter dated December 17, 1986 (Log No. 2166)
-were responded to with Toledo Edison letter dated May 27, 7.987 (Serial No. 1361). The responses committed Toledo Edison to provide the results of ongoing reviews by July 31, 1987. The reviews have been completed and are attached for your review and use.
Very tr y yours, I
s
'FC:pif attachment cc: DB-1 NRC Resident Inspector A. B. Davis, Regional Administrator (2 copies) 5 8708050273 870730
/ ggh ADOCK 0 % 3 p
PDR 9
e THE TOLEDO EDISON COf.iPANY EOISDN PLAZA 300 MADISON AVENUE TOLEDO. OHIO 43652
1
)
Dockat No. 50-346 License No. NPF-3 Serial No. 1396 Attachment
)
Page 1 Question No. 6 - Independent Sprinklers and Hose Stations Regarding [FHAR] Table 4-1, Sheet 4, except for the Turbine Building, j
identify any locations (s) where sprinkler systems and standpipe systems 1
are supplied from a single water supply pipe and describe how "back-up" I
fire fighting capability will be provided if a failure in this pipe occurs.
Response
Toledo Edison has identified twelve rooms provided with sprinkler and hose stations supplied by a single water pipe outside the Turbine Building.
Three of the rooms are provided with an alternate hose station and require no modification. The remaining nine rooms will be modified to provide separation between the sprinkler and hose stations.
The three rooms provided with alternate hose stations are:
Room Room No.
Backup System Diesel Generator 1-2 Room 319 Hose House (HH) 15 Main Workshop, Tool Crib, Supply Storage 336 Hose Connection (HC) 28 Service Water Valve Roon 53 Hose Station (HCS) 20 The nine rooms requiring modification (s) are:
Room Room No.
Diesel Fire Pump Room 51 Diesel Generator 1-1 Room 318 Day Tank 1-2 Room 320A Day Tank 1-1 Room 321A No. 2 Mechanical Penetration Room 236 No. 1 Electrical Penetration Room 402 Boric Acid Evaporation Room 235 Passage 227 Passage / Hatch Area 310/313 Toleda Edison has. identified those locations where sprinklers and hose stations are supplied fron a single water pipe. Design changes are currently underway for the nine rooms requiring modification to provide isola tion capabilities between the sprinkler and hose stat' on.
The design changes will eliminate locations containing sprinklers and hose stations supplied by a common water source. These design changes and the procedure chang es to designate the alternate hose stations will be implemented prior to ti.e return to power from the sixth refueling outage.
i Further Response Toledo Edison believes that no further response is necessary to resolve this NRC question.
(-_-----
Dockst No. 50-346
. License No.-NPF-3 Serial No. 1396 Attachment Page 2
, Question No. 26 - IE Information Notice 86-[9 Provide a discussion regarding how you are addressing the concerns expressed in IE Information Notice 86-79.
Response
IE.Information Notice 86-79 dated September 2, 1986 (Log No. 1-1461) is i
entitled " Degradation or Loss <of Charging Systems at PWR Nuclear Power Plants Using Swing Pump Designs." IE Information Notice 86-79 discusses j
how the safety function of charging. systems using a swing-pump design can be degraded or lost as the result'of. design deficiencies in interlocking circuitry or inadequacies in maintenance procedures.
Toledo Edison has determined that IE Information Notice 86-79 is not specifically applicable to Davis-Besse in that no charging pumps incor-porating a swing pump design are utilized. However, a swing pump design is applied to the Component Cooling Water System and the Service Water System. Electrical'Pcwer is supplied to these systems by essential
. busses.
The swing pump configuration is similar for both systems. Each dedicated pump has a breaker on its respective essential bus. The swing pump incorporates two mechanically interlocked transfer switchgear breakers, each fed by an essential bus breaker.
The service water system requires that two pumps operate under normal operating conditions; only one pump is required to operate under accident conditions. The interlocks for this system allow for the operation of two pumps per bus for changeover.
The Component Cooling Water System requires one operating pump at all times. The interlocks for this system allow for one operating pump per bus.
The Service Water System and Component Cooling Water System pumps are considered to be safe shutdown components required in the event of a fire.
Based on the above review, a failure of the type discussed in IE Informa-tion Notice 86-79 is not possible at Davis-Besse. No changes to the 10CFR50 Appendix R Compliance Assessment Report have been identified as a result of IE Information Notice 86-79.
Further Response Toledo Edison believes that no further response is necessary to resolve thte NRC question.
_ _ - - _ _ _ - - _ - _ - - _