ML101670520

Fire Protection Screening Criteria - V.C. Summer Nuclear Station

ML101670520
Person / Time
Site:	Summer
Issue date:	06/17/2010
From:	SCANA Corp, South Carolina Electric & Gas Co
To:	NRC/NRR/DIRS/IRIB
Jeremy Bowen, 415-3471
Shared Package
ML101670555	List: ML101670428 ML101670490 ML101670501 ML101670520 ML101670523 ML101670548
References
Download: ML101670520 (21)

Text

Enclosure 6 V.C. Summer Nuclear Station Presentation Meeting Summary of the 6/8/2010 Meeting with NRC/SNC/FPL/SCE&G Dated June 17, 2010

co

.- c::

C 0

L..

Q)

I

• c 0> ,..,0

~

CI)

I

• I

• L.. 10",

t) Q) cu Q)

I *

()

O>~

Q) -CI>

( ,)

0 ~

C L..

a.. .- t)

.- EE 10",

CI>

Q) ..c  :::

CI)

L..  ::::J ,

lJ;;; a.. s (.)

~

i:

j$

II)

It

(/)

...CJ~

+-'

c Q) i E !5 E

a c i:::i II) 0 a cj C) (/)

~

c (/)

J C U CO Q) c.. .- c

(/)

"'C 0 0 .- a (/)

s:: "0 .-

ro +-' +-'

c CD c ....

(/)

ro .-

Q) c Q)

C) ro E

+-'

<< (/)

c 0 I- E a C) L(") a

+-' C 0 0 U ex) C)

J C "0

a ....

Q) << .-c

.... Q) Il... (/)

+-'

c u C/)

LL Z

-0a

Screening Criteria Identified for VCSNS

• SISBO mitigation strategy

• A relatively large number of manual operator actions used to mitigate cable separation Issues

• Operator manual actions that are complex

____________________ v.c. SUMMER NUCLEAR STATION

SISBO Mitigation Strategy

• VSCNS utilizes a SISBO Appendix R fire mitigation strategy

• SISBO ensures one train of equipment free from fire damage

• But it reduces:

- mitigation equipment availability

- requires local manual operator actions

____________________ v.c. SUMMER NUCLEAR STATION

Number of IPEEE Operator Actions

• 66 detailed modeling HEPs

• Both Inside and Outside of the Control Room

• Most zones use -20 HEP's to get to stable conditions

• 8 Risk significant HEP's (RAW> 2)

____________________ v.c. SUMMER NUCLEAR STATION

Complexity of IPEEE Operator Actions

• OMAs typically consist of only a few steps

• Many of the steps are used in normal operation and for routine equipment LOTO for maintenance

• Critical actions have been determined to be Feasible and Reliable through Engineering analysis and Operator walkdowns

____________________ v.c. SUMMER NUCLEAR STATION

Mitigation of Operator Action Complexity

• Job Performance Measures (JPMs) provide assurance that the actions would be successfully completed

• Any special equipment is pre-staged

• Added battery lighting

• Component marking was improved.

• Procedures are continuous use and require place-keeping

____________________ v.c. SUMMER NUCLEAR STATION

IPEEE Insights

• The Fire Emergency Procedures (FEPs) are sound and workable.

- Several improvements were identified and incorporated

• Today the FEPs are routinely trained on and improvements are identified and incorporated

____________________ v.c. SUMMER NUCLEAR STATION

IPEEE Insights Used to Reduce Fire Risk

• Train operators on IPEEE risk insights

• Train Fire Brigade Members on IPEEE risk insights

____________________ v.c. SUMMER NUCLEAR STATION

c:

Q)

E a.

..c:

(1)

E a.

c:

g 1$

II)

It:

...~

(.)

i

~

l5

~

Q)

l

'to- II) u::.:

t:

Q)

"'C t:

Q)

E

.-a.

l C'"

W

Screening Criteria Applicable to V.C. Summer

• One screening criterion applies:

- SISBO mitigation strategy

• Two screening criteria do not apply:

- A relatively large number of manual operator actions

- Operator manual actions that are complex

____________________ lI.c. SUMMER NUCLEAR STATION

Summary of Current Program

• VCSNS is aware of the risk level associated with the SISBO fire mitigation strategy

- quantified during the IPEEE

- actions taken to minimize that risk

• The station is transitioning to NFPA-805 to further minimize the risk

____________________ v.c. SUMMER NUCLEAR STATION

Transitioning to NFPA 805

• NFPA805 Project Goals:

- Full compliance with NFPA805

- Eliminate SISBO

- Address Multiple Spurious Operations

- Reduce or eliminate Operator Manual Actions

- Clear and concise Configuration Management Documents

____________________ v.c. SUMMER NUCLEAR STATION

NFPA 805 Project Status

• Revised Shutdown Strategy

• Nuclear Safety Compliance Assessment

• Fire PRA (Peer Review Aug 2010)

• Fire Protection Program Features/Admin Controls

• Current Benefits (Insights)

____________________ v.c. SUMMER NUCLEAR STATION

NFPA 805 Project Status

• Preliminary Results

- Fire Outside Main Control Room: No OMA (Recovery Actions)

- LAR Submittal: Early Finish, 4th Qtr 2010

____________________ v.c. SUMMER NUCLEAR STATION

NFPA805 Compensatory Actions

• Compensatory Measures initiated

- NFPA805 Modifications

- Fire Modeling Solutions

• Engineering Analysis

- Assess insights against Current Licensing Basis (CLB)

- Determine appropriate Compensatory Measures

____________________ v.c. SUMMER NUCLEAR STATION

NFPA805 Compensatory Actions

• PRA Analysis

- Review NFPA805 insights outside CLB

- Conduct risk assessment

____________________ v.c. SUMMER NUCLEAR STATION

~

r::::

(1)

E E

o o

en r::::

t/)

o o-