ML19345E611
| ML19345E611 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 09/29/1977 |
| From: | Bixel D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Desiree Davis Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8102050291 | |
| Download: ML19345E611 (4) | |
Text
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Consumers g 4,8/ 4 7 p a,, D 0 F Pay!ct company o.n r.i on c.. m w..t wichie.n ^<enu...s.ck om uache.n 4em. Ar.. coo. et7 78a.oeso s
September 29, 1977
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y e'#' N'WQ. wca, k Director of Nuclear Reactor Regulation
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Att: !1r Don K Davis, Acting Branch Chief st.
C /J'g'h)('0, Operatin6 Beactor Branch No 2.
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US Nuclear Regulatory Co :ission Washington, DC 20555 DOCl3 50-155 - LICENSE DPR BIG RO~E P0HC PLtJC -
FIRE AREA #33A Sy letter dated April 5, 1977 Consumers Power Cc=pany identified a fire area that had not been reviewed in our Fire Safety Analysis dated March 29, 1977 The review of this area is nov ec=plete and the results are attached as Fire Area #33A.
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David A Bixel Nuclear Licensing Administrator
'CC: JGKeppler, USURC 9 971 f/Dc?D$ hkf
m 9-1-77 FIRE HAZARDS AtlALYSIS R9v. 1 BIG ROCK P0fNT
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FIRE AREA # 33A At ea South of Reactor -
SHEET 1 0F 3 Caule Trays From Interior CLASSIFIrATION Vital Penetration to Room 441 DWG. M-101 A.
GENEPAL The area is located inside the containment sphere starting at the interior cable penetration room and extending around the east and north sides of the fuel pool structure to Room 441. The fire loading for this area is light to moderate.
B.
FIRE BARRIER 3 DEFINING THE AREA The area is bounded by a reinforced concrete shield wall on the west and south sides, is bounded by the Reactor Building sphere southeast and east sides and is open to the Reactor Building on the north.
C.
IDENTIFICATION OF E0VIPMENT 1.
SAFETY-RELATED OR OTHER SYSTEMS THAT COULD PROVIDE FOR SHUTDOWN OR C00LD0KN:
The area contains cables from the interior penetration room to Room 441 and beyond. Safety related systems included in the cabling and penetratioas, in part, are as follows:
a.
b.
Reactor cooling water system.
c.
Control rod drive system.
2.
SAFETY-RELATED SYSTEMS CONTROLLING OR MITIGATING THE RELEASE OF RADIO.
ACTIVITY:
a.
None.
3.
OTHER SAFETY-RELATED SYSTEMS OR EQUIPMENT:
a.
A detailed analysis of other safety-related circuits that pass through area has not been completed.
4.
RADI0 ACTIVE MATERIAL RELEASED AS A RESULT OF AREA FIRE:
a.
None.
D.
FIRE CONSEQUENCES Separation of redundant channels of systems which could be used to shut down and cool down the reactor does not generally exist.
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VII-108A
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9-1-77 FIRE HAZARDS ANALYSIS Rev. 1 BIG ROCK POINT
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FIRE AREA # 33A Area South of Reactor -
SHEET 2 0F 3 Cable Trays From Interior CLASSIFICATION Vital Penetration to Room 441 DWG. M-101 1.
DESIGN BASIS FIRE - EFFECT ON CAPABILITY TO SHUT DOWN AND COOL D0WN THE PLANT AND PRECLUDE RELEASE OF RADI0 ACTIVITY:
The fire could affect the ability to shut down and cool down the plant. The only fire consequence that would preclude the safe shutdown of the plant would be a hot short affecting more than one control rod. The possibility of a hot short affecting any control rod is considered extremely remote.
It is possible that the ability to shut down arid cool down the plant would be affected if the fire were undetected for a significant length of time and allowed to propagate to all equipment and cable trays in the area.
However, this is con-sidered highly improbable based on the light overall fire loading, the early in-dication of fire available from the P0C detectors at the penetration end end the rapid response available to curtail the propagation of the fire.
2 FIRE PROTECTION SYSTEM ACTUATION - EFFECT OF THE FIRE IF THE FIRE PROTECTION SYSTEM FUNCTIONS AS DESIREE: Present fire protection is not considered ade-quate, thus the same consequences as D.l. above may be expected.
E.
COMBUSTIBLE MATERIALS The only combustibles are the cables in the four cable trays.
F.
FIRE DETECTION AND PROTECTION 1.
Fire detection is provided by P00 detectors located in the ceiling of the cable penetration room. Other area fire detection is by discovery. The
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area is part of the operator's rounds.
2.
Fire protection is by manual hose station and portable extinguishers. Access to cable trays for manual fire fighting is' considered adequate.
G.
PLANT FEATURES WHICH CONTAIN FIRE 1.
Flame Retardant Cable Materials: None.
2.
Fire Stops: No fire stops are present in trays.
3.
Penetration Fireproofing: None used.
4.
Fire Barriers / Distance: Building walls provide an adequate barrier to other areas except for the open side. Spread of fire from this side to other
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areas-of the Reactor Building is not expected.
5.
Cable Coatings: None used.
VII-108B
9-1-77
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FIRE HAZARDS ANALYSIS Rev. 1 BIG ROCK POINT i
FIRE AREA # 33A Area South of Reactor -
SHEET 3~~~ of ---3 Cable Trays From Interior CLASSIFICATION Vital Penetration to Room 441 DWG. M-101 H.
PROTECTION PROVIDED AGAINST INADVERT'ENT OR CARELESS OPERATION OR RUPTURE OF EXTINGUISHlilG SYSTEMS Not applicable.
J.
PLANT MODIFICATIONS 1.
Standpipe with fire hose to be installed adjacent to cable penetration room at elevation 600' - 6".
2.
Alternative methods are being evaluated for these trays to insure safe shutdown and cooldown. These include:
a.
Additional automatic detection and suppression systems.
b.
Fire carriers and flame resistant coatings.
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c.
An additional redundant and separatc safe shutdcwn/cooldown train.
d.
Separation of safety-related cables.
K.
COMPLIANCE TO SECTION A.2. AFTER MODIFICATION The methods and modifications chosen should result in the area meeting the Building Design Acceptability Tree, Figure 1.
With fire retardant coatings on the cables and penetrations, fire detection and suppression, including manual backup, and possibly an additional redundant and separate shutdown train, the requirements of the Success Tree for Safe Shutdown, Figure 3, will be satisfied in the event of a fire in this area.
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VII-108C
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cats or occLusNT Consumers Power Company 9/29/77 Mr. Don K. Davis J ckson, MichiFan oAra mactivso David A. Bixel 1D/5/77 jECarTan CNoTonizso amoe iNeur somu Nuusen or copies muctivso
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