ML20148N762

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Forwards Rev 2 to Program Instruction PI2 Risk Significance Determination & Listed Documents to Provide Insights Used for Risk Significance Determination Associated W/Unit 2 Maint Rule & Process & Criteria for Determination of Rule
ML20148N762
Person / Time
Site: Millstone Dominion icon.png
Issue date: 06/24/1997
From: Curry D
External (Affiliation Not Assigned)
To: Imbro E
NRC
Shared Package
ML20148N766 List:
References
NUM2-PPNR-0250, NUM2-PPNR-250, NUDOCS 9706300130
Download: ML20148N762 (7)
v • d • e


Text

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PARSONS m3 Parsons Power Group inc. 2675 Morgantown Road Reading, Pennsylvania 19607 -(b10) 855 2000 Fax: (610) 855 2001 i

l Date:

6/24/97 Doc. ID: NUM2-PPNR-0250-L Mr. E. V. Imbro Deputy Director for ICAVP Special Project Office U. S. Nuclear Regulatory Commission Washington, DC 20555

[

Re:

Millstone Unit 2 ICAVP i

Action By:

NA i

Action Date: NA

Reference:

NA I

Dear Mr.Imbro:

1 Item 3(b) of part IV of the confirmatory order requires the ICAVP team to provide the NRC with risk / safety based criteria for system selection. The Parsons Power ICAVP Audit Plan identifies several criteria that could be used for system selection. The following criterion is applicable to risk based selection.

"Has a high level of risk significance based on PRA insights as determined by a panel of individuals familiar with the Plant PRA."

The following documents are attached and intended to assist the NRC panel that is responsible for system selection. These documents provide insights that were used for risk significance determination associated with the Millstone Unit 2 Maintenance Rule.

Risk Significant Systems (Form 5-PI2) e, System Train Risk Significant Prioritization Form 5 provides PRA developed data on the risk significance data for Risk Achievement Worth (RAW) and Risk Reduction Worth (RRW). Attachment I lists the corresponding Fussel-Vesely factor for the system which is a sensitivity measure related to the Core Damage Frequency (CDF) associated with the system. Also attached to Millstone Program Instruction PI2 " Risk Significance Determination" which provides the Millstone process and criteria for determination ofMaintenance Rule system risk significance.

Please call me at (610) 855-2366 if you require additional information.

Sincerely,

- Y ad Daniel L Curry

/

Project Director

[

DLC:djv g

Attachments I

9706300130 970624-PDR ADOCK 05000336 P

PDR I cf I Encompass letter Ppar0250. Doc

i 9$

l System Train Risk Significant Prioritization Deserlotion FV Turbine Driven AFW Train 'B' O.335 Motor Driven AFW Train 'B' O.242 Motor Driven AFW Train 'A' O.221 _

EDG~ Train 'B' 0.145 125v Emergencv DC Train 'A' O.145 EDG Train 'A' O.126 125v Emergency DC Train 'B' O.126 RPS 0.087 Service Water Header 'A' O.065 Service Water Header 'B' O.065 Main Feedwater Train 'A' O.057 Main Feedwater Train 'B' O.057 Sump Recirculation Train 'A' O.054 Sump Recirculation Train 'B' O.054 Bus 240 0.039 Bus 24D 0.039 ESF Room COOllna Train 'A' O.036 ESF Room Coollna Train 'B' O.036 RBCCW Header 'A' O.033 120v Vltal AC Train 'A' O.027 HPSI Train 'A' O.027 HPSI Train 'B' O.027 SRV Train 'A' O.027 SRV Train 'B' O.027 RBCCW Header 'B' O.027 RSST 0.022

.PORV / Block Valve Train 'A' O.0196 PORV / Block Valve Train 'B' O.0196 DC SWGR Ventilation Train 'A' O.015 DC SWGR Ventilation Train 'B' O.015 ADV Train 'A' O.011 ADV Traln 'B' O.011 Containment Spray Train 'A' O.007 Containment Spray Train 'B' O.007 LPSI Train 'A' O.007 LPSI Train 'B' O.007 l

SIT #1 0.007 i

SIT #2 0.007

i Description FV SIT #3 0.007 i

SIT #4 0.007 120v V tal AC Train 'B' O.004 j

Emergency Boration Train 'A' (Gravity Feed) 0.002

\\

j Emergency Boration Train 'B' (Pumps) 0.002 1

SDC 0.002 RWST 0.0006 ESAS Train 'A' O.0003 i

ESAS Train 'B' O.0003 Instrument Air Supply Header 0

instrument Air Compressors 0

i CARF Train 'A' 0

l l

CARF Train 'B' O

l MSIV # 1 0

l i

MSlV # 2 0

_ 4160v Emeraency AC Train 'A' N/A 4160v Emergency AC Train 'B' N/A i

6.9kv AC N/A Shutdown Cooling Train 'A' N/A Shutdown Cooling Train 'B' N/A i

l 1

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l 2

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FORM 5

~

PRA RISK SIGNIFICANT SYSTEMS Plant: ME2

'i FRONT-LlHE SYSTEM CDF RAW RRW RISK PLANT SYSTEMS SUPPORT SYSTEMS j

(Y/N)

(Y/N)

(YlN)

(YIN)

Auxiliary Feedwater Purnp Y

43.4 1283 Y

Auxiliary Feedwater 'A' All Support Systems j

'A' (Y)

(Y)

Modeled i

'1 Auxilary Feedwater Puinp Y

45.4 1.319 Y

Auxfiary Feedwater'B' All Support Systems

-l

'B' (Y)

(Y)

Modeled l

TurtaineDriven Auxiliary Y

20.5 1.503 Y

Tuttine Driven Auxiiary All Support Systems Feedwater Pump (Y)

(Y)

Feedwater Pump Modeled RPS Y

7363 1.096 Y

Reactor Portection All Support Systems (Y)

(Y)

NI Linear Power Range Modeled Conrtol Element Drive Ctmt Surnp Recirculation Y

28.2 1.056 Y

RWST All Support Systems

'A' (Y)

(Y)

Contairment Spray Modeled r

CtmtStrup Recirculation Y

28 1.056 Y

BWST All Support Systems

'B' (Y)

(Y)

Containment Spray Modeled Emergency Diesel Y

4.1 1.144 Y

Emergency Diesel D/G Fuel Oil Generator 'A' (Y)

(Y)

Generator'A' D/G Room Ventilation Control Panels

\\

' Chilled Water g

Emergency Di el Y

4.4 1.169 Y

Emergency Diesel D/G FuelOil Generator 'B' (Y)

(Y)

Generator'B' D/G Room Ventilation i

Control Panels l

Chilled Water 125 Volt D0dA' Y

152.7 1.17 Y

125 VoR DC 'A' None i

(Y)

(Y) 125 Voit DC 'B' Y

157.7 1.144 Y

125 Vot DC *B' None (Y)

(Y)

Service Water'A' Y

69.7 1.07 Y

Service Water'A' All Support Systems (Y)

(Y)

)

Modeled

FORM 5 PRA RISK SIGNIFICANT SYSTEMS t

Flart: MP_2

[

t PLANT SYSTEMS SUPPORT SYSTEMS FRONT-UNE SYSTEM CDF RAW RRW RISK (Y/N)

(YIN)

(Y/N)

(Y/N)

Service Water 'B' Y

69.7 1.07 Y

Service Water 'B' Al SupportSystems (Y)

(Y)

Modeled

[

SRVA Y

8.4 1.028 Y

Pressurizer None (Y)

(Y)

SRV B Y

8.4 1.028 Y

Pressurizer None (Y)

(Y)

PORV / Block Valve A Y

23.7 1.02 Y

Pressurizer Al Support Systems (Y)

(Y)

Modeled PORV/ Block Vake B Y

23 6 1.02 Y

Pressurizer All Support Systems l

(Y)

(Y)

Modeled Main Feedwater'A' Y

1.1 1.06 Y

Main Feedwater'A' AllSupport Systems (N)

. (Y)

Modeled 1.06 Y

Main Feedwater B*

AH Support Systems Main Feedwater 'B' Y

1.1 4

(N)

(Y)

Modeled ESF Room Cooling 'A' Y

12 1.037 Y

ESF Room Coohng 'A' Chilled Water (Y)

(Y)

ESF Room Cooling 'B' Y

11.9 1.037 Y

ESF Room Cooing 'B' ChiRed Water (Y)

(Y)

HPSI 'A' Y

22.6 1.028 Y

Hgh Pressure SI'A' AB Support Systems D')

(Y)

Modeled HPSl *B' Y

22.4 1.028 Y

High Pressure SI'B' AllSupport Systems (Y)

(Y)

Modeled LPSI'A' Y

4.8 1.007 Y

Low Pressure SI'A' AllSupport Systems l

(Y)

(Y)

Modeled LPSI 'B' Y

4.8 1.007 Y

Low Pressure Si'B' AllStpport Systems 3"

(Y)

(Y)

Modeled RBCCW 'A' Y

20.3 1.034 Y

RBCCW 'A' AllStpport Systems l

(Y)

(Y)

Modebd l

i

--- a - - -

x-x- --

_ _ ~.

FORM 5 PRA RISK SIGNIFICANT SYSTEMS l

Plant: ME i

FRONT-LINE SYSTEM CDF RAW RRW RISK PLANT SYSTEMS SUPPORTSYSTEMS l

(Y/N)

(Y/N)

(Y/N)

(Y/N) l RBCCW 'B' Y

20.4 1.028 Y

RBCCW 'B' Al SupportSystems (Y)

(Y)

Modekxi 120 Vot AC 'A' Y

12.9 1.028 Y

120 Volt VitalRegulated 'A' Control Panels (Y)

(Y) 120 Volt AC 'B' Y

11.1 1.004 Y

120 Vot Vital Regulated 'B' Control Panels (Y)

(N)

Atmosfide Dunp Valve Y

1.42 1.011 Y-Main Stearn System 'A' Control Panels

'A' (N)

(Y) i Atmospheric Dunp Valve Y

1.42 1.011 Y

Main Stearn System 'B' Control Panels (N)

(Y)

DC SWGR RoomCooling Y

1.43 1.015 Y

VitalSWGR Emergency ChiNed Water

'A' (N)

(Y)

Cooing 'A' DC SWGR RoomCooling Y

1,44 1.015 Y

VitalSWGR Emergency Chilled Water

'B' (N)

(Y)

Cooling 'B' AC Bus 240 Y

336.1 1.041 Y

Station Elect. Syc. -4.16KV ControlPanais I

(Y)

(Y) l AC Bus 24D Y

285.6 1.031 Y

Station Elect. Sve. - 4.16KV Control Panals (Y)

(Y)

EmergencyBoration Y

1.03 1.002 Y

CVCS-Voleme Contml A!! Support Systams (Purnps)

(N)

(N)

BoricAcid Modeled i

Emergency Boration Y

f.08 1.002 Y

CVCS-Volume Control AllSupportSystems (Gravity Feed)

{N)

(N)

Boric Acid Modeled

  1. 1 SlT Y

9.6 1.007 Y

Safety in). Tanks None (Y)

(Y)

  1. 2 SIT Y

9.6 1.007 Y

Safety ini. Tanks None (Y)

(Y) t

4 ll

. FORM 5 i

PRA RISK SIGNIFICANTSYSTEMS Plant: hLP2 FRONT-LINE SYSTEM CDF

! RAW RRW RISK PLANT SYSTEMS SUPPORT SYSTEMS I

(Y/N)

(Y/N)

(Y/N)

(Y/N) i j

  1. 3 SIT Y

9.6 1.007 Y

SafetyInf. Tanks None i

(Y)

(Y) t

  1. 4 SIT Y

9.6 1.007 Y

Sciety inj. Tanks None l

..i (Y)

(Y) l 1

Shutdown Cooling Y

1.18 1.002 Y

Shutdown Cooling AlSupportSystems l

.i (N)

(N)

Modeled I

RSST Y

57.7 1.022 Y

RSST Af S@ port Systems (Y)

(Y)

ModeleJ RWST Y

295.9 1.0006 Y

Refueling WaterStorage None (Y)

(N)

Tank Containment Spray 'A' Y

1.23 1.007 Y

Contairment Spray'A' AR Support Systems (N)

(Y)

Shutdown Cooling Modeled Contalmnent Spray 'B' Y

1.19 f.007 Y

Containment Spray 'B' AllSupport Systems i

(N)

(Y)

Shutdown Cooling Modeled MSIV #1 Y

1.44 1

Y Main Steam System AllSupport Systems (N)

(N)

Modefed MSIV #2 Y

1.44 1

Y Main Steam System AllSupport Systems (N)

(N)

Modeled instnrnent Air'A' N

1 1

N Instrument Air'A' None i

(N)

(N) instnirmrd Air B' N

t 1

N Instrurnent Air'B' None (N)

(N)

ESAS 'A' N

9.9 1.0003 Y

ESAS 'A' Alls @ port Systems (Y)

(N)

Modeled ESAS 'B' N

11 1.0003 Y

ESAS 'B' AH Support Systems (Y)

(N)

Modeled i

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