ML030860310

Cable Spreading Room (Csr) Sprinkler System

ML030860310
Person / Time
Site:	Brunswick
Issue date:	02/25/2003
From:	Progress Energy Co
To:	Office of Nuclear Reactor Regulation
References
Download: ML030860310 (16)

Text

i Progress Energy 2/25/2003 1

Agenda EZZ - -.

• Introduction David Hinds

• Presentation o Licensing Basis Lenny Belier o Present Concern Roger Sims o Resolution Roger Sims

• Conclusion David Hinds SlProgress Energy 2

2/25/2003

Licensing Bases i March 1981: Exemption Requested for Automatic Suppression in Control Room (CR) and CSRs

• November 1981: Exemption G ranted for CR o CSR Addressed Separately

• July 1982: NRC-CP&L Meeting 9 November 1982: NRC Denied Exemption Request SsProgress Energy 2/25/2003 3

Licensing Bases e May 1983 Exemption Request o "We propose the installation of a manually operated, fixed sprinkler system located below the cable trays for these zones. The suppression systems will be designed to extinguish a transient combustible fire. We believe the proposed manually operated, fixed, sprinkler system will provide protection equivalent to Section IiI.G.3, 10CFR50, Appendix R."

C Progress Energy 2/25/2003 4

Licensing Bases

• July 1983 SER o "However, you have proposed to install a manually operated sprinkler system in the cable spreading room of each Brunswick unit. This type of fixed fire suppression meets the requirements of Section III.G.3 and therefore, an exemption is not needed.... Based on this discussion, we understand that you will begin modification of the Diesel Generator Building equipment hatches and the installation of fixed floor-mounted suppression systems in the Cable Spreading Rooms within six months."

SvProgress Energy 2/25/2003 5

Licensing Bases

. Resident Inspector Considered Configuration a Risk Concern

• Task Interface Agreement Sent to NRC Headquarters

• Violation Proposed Against GDC 3 Progress Energy 2/25/2003 6

Present Concern - Initial Response I-

. Technical Study Performed i Correlated Sprinkler Response Vs. Cable Damage Time

• Due to Lack of Validated Analysis Method Study Assumed Sprinkler System Would Not Actuate for Fire between Heads.

D Resident Inspector Provided a [Draft Copy of Study SJProgress Energy 2/25/2003 7

Plan View ISO=Islam Sprinkler Heads SJProgress Energy 2/25/2003 8

Section View N a-m,, - -.

Trays Plume y _-------Sprinkler Head Fire Progress Energy 2/25/2003 9

Present Concern - Study Results 47, o 146 kW Fire P No Cable Damage in 30 Minutes o639 kW Fire SCi8tble Damage in 30 Minutes o783 kW Fire I Cable Damage in 20 Minutes 9 In No Cases Were both Trains Damaged Due to a Si ngle Fire Progress Energy 2/25/2003 10

Present Concern

• 10/2/02 NRC Inspection Report 02-03 o The licensee failed to install fixed fire suppression systems that were capable of minimizing damage to safe shutdown cabling caused by floor level transient combustible fires in the Unit 1 and Unit 2 Cable Spreading Rooms (CSRs). The systems were determined to be unable to fulfill their intended function of limiting fire damage to the preferred trains of safe shutdown cables and safety-related cables in the CSRs.

Energy S 2/25/2003 11

Alternatives for Resolution EZZ.

• Install C,ode Compliant Sprinkler System above and within Cable Trays SSprinkler Contractor Stated Code Compliance May Not Be Pc )ssible o May Not Satisfy FSAR Commitment 8 Progress Energy 2/25/2003 12

Alternatives for Resolution rzzz

• Remove Sprinkler Links o System Will Not Support All Heads Flowing Hydraulically I Drainage Is a Problem Progress Energy 2/25/2003 13

Alternatives for Resolution

. Strengthen Other Areas of Defense-In-Depth P Requires NRC Approval o No Physical Changes to Sprinkler System Progress Energy 2/25/2003 14

Resolution LITI - 1,. - 4.....

"* Restrict Transient Combustibles below that Analyzed as Capable of Causing Cable Damage

"* Install Incipient Fire Detection System

"* Convert System from Manual to Automatic

. Submit Change to Licensing Basis to Remove Term "and Extinguish" Progress Energy 2/25/2003 15

Conclusions 77-E

. Questions?

SJProgress Energy 2/25/2003 16