ML20235X392

Forwards List of Plant Enhancements Being Considered by Util for Implementation,For Upcoming Visit.Purpose of Visit to Understand Status of & Schedule for Each Enhancement & to Identify Any Significant Potential Downside

ML20235X392
Person / Time
Site:	Pilgrim
Issue date:	07/20/1987
From:	Thadani A NRC
To:	Chopra O, Teh-Chiun Su, Tinkler C NRC
Shared Package
ML20234D382	List: IA-87-643, Trip Rept of 870722-23 Visit to Braintree,Ma to Discuss Proposed Safety Enhancement Program at Plant ML20234D379 ML20235X375 ML20235X392 ML20237L175
References
FOIA-87-643 NUDOCS 8707240168
Download: ML20235X392 (2)

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• UNITED STATES fi l', ~% NUCLE AR REGULATORY COMMISSION i$

i i g >M ,E WASHINGTON, D. C. 20$$6 k )

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NOTE T0: Charles Tinkler 1 Tsung Ming Su i 1

0. P. Chopra  ;

g, FROM: Ashok Thadani $I i S

SUBJECT:

UPCOMING TRIP TO PILGRIM j[

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The attachment identifies the plant enhancement being considered by Deco 4 for implementation at Pilgrim. The purpose of your visit to Pilgrim g is to a) understand the status of and schedule for each of the identified y enhancements, b) identify / discuss any significant potential downside (for T designbaseandbeyonddesignbaseaccidents)fromanyoftheidentified _

modifications. The primary purpose of the trip is to understand the _

- changes and their safety significance, an'd the secondary purpose is to .

review the licensee's 50.59 evaluation. Please note that it is important i that your review truly be interdisciplinary and, thus, it becomes impera- #

tive that you collectively discuss the signific nee of each change. (

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'Shl ka

,y Ashok Thadani ':

Enclosure:

As stated

u cc: J. Craig/J. Kudrick 3 W. Hodges/R. Jones ~$

F. Rosa / J. Knight d

L. Shao S. Varga g 3

• R. Weisman

-  % p A707240160 070721 1 Jp k X4 4

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1.s0 INTRODUCTION 1.1 Purpose of Report 1.2 Scope of Report y 1.3 Safety Enhancement Program Coals ylt':

1.4 Safety Enhancement Program Plant and Operational Changes 2.0 OVERVIEW 0F SAFETY ENHANCEMENT PROGRAM Q 2.1 Background y \

1 2.2 Safety Enhancements l 7

3.0 DESCRIPTION

OF SPECIFIC PLANT SAFETY ENHANCEMENTS 3.1 General Considerations 3.2 Installation of a Direct Torus Vent System (DTVS) N d ' '

3.3 Containment Spray Header Nozzles I MIb4 '

3.4 Additional Sources of Hater for RPV Injection and Containment *

.' Spray 'T, u h b/ Cd4/ ,. .5%

3.5 Diesel Fire Pump for RPV Injection and Containment Spray $ M *,

3.6. Diesel Pump Fire Pump Fuel Oil Transfer System C/M[ ^'

3.7 Backup Nitrogen Supply System M k bw/(I$ 0 3.8 Blackout Diesel Ge erator Including Protected Installation Facilities c /t A rA 7 Qts p m a n.!, A) e 3.9 Automatic Depressurization System logic Modifications' h

1 l, t WW I T 3.10 Addition of Enriched Boron to Standby Liquid Control System.,3.4 ,

%e-3.11 ATHS f eedwater Pump Trip - 14 3 3.12 Modifications to Reactor Core Isolaticn Cooling System Turbine Exhaust Trip Setpoint . SW 3.13 Additional ATHS Recirculation Pump Trip - M ud I 'h ~ 14 tjb

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4.0 DESCRIPTION

OF OPERATIONAL PLANT SAFETY ENHANCEMENTS

5.0 CONCLUSION

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o UNITED STATES NUCLEAR REGULATORY COMMISSION h  ;$ WASHING TON, D. C. 20555 k*****,/ July 20,1987 NOTE T0: Charles Tinkler Tsung Ming Su

0. P. Chopra FROM: Ashok Thadani

SUBJECT:

UPCOMING TRIP TO PILGRIM The attachment identifies the plant enhancement being considered by BECo for implementation at Pilgrim. The purpose of your visit to Pilgrim is to a) understand the status of and schedule for each of the identified enhancements, b) identify / discuss any significant potential downside (for design base and beyond design base accidents) from any of the identified {

modifications. The primary purpose of the trip is to understand the i

- changes and their safety significance, and the secondary purpose is to review the licensee's 50.59 evaluation. Please note that it is important that your review truly be interdisciplinary and, thus, it becomes impera-tive that you collectively discuss the signific nce of each change.

Ashok Thadani

Enclosure:

As stated cc: J. Craig/J. Kudrick W. Hodges/R. Jones j F. Rosa / J. Knight l L. Shao S. Varga _ W i R. Weisman l 1 1

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% towre 1 3

1.0 INTRODUCTION

~

1.1 Purpose of Report 1.2 Scope of Report i j

1.3 Safety Enhancement Program Goals Safety Enhancement Program Plant and Operational Ch'anges f

1.4 2.0 OVERVIEH OF SAFETY ENHANCEMENT PROGRAM  :

2.1 Background 2.2 Safety Enhancements

3.0 DESCRIPTION

OF SPECIFIC PLANT SAFETY ENHANCEMENTS 3.1 General Considerations b'd ^f 3.2 Installation of a Direct Torus Vent System (DTVS) 3.3 Containment Spray Header Nozzles N/b+

3.4 Additional Sources of Water for RPV Injection and Containment Spray 'T,w h 44/ C4 J%

3.5 Diesel Fire Pump for RPV Injection and Containment Spray MA4

'7 '"

3.6. Diesel Pump Fire Pump Fuel Oil Transfer System C/M/Y^'

3.7 Backup Altrogen Supply System MIbw[(d of*

3.8 BlackoutDieselGe(eratorIncludingProtectedInstallation

- Facilities c.dAjrrA 66 -H',

3.9 Automatic Depressurization System Logic Modifications' i 3.10 Addition of Enriched Boron to Standby Liquid Control System ,5,a t^

3.11 ATHS Feedwater Pump Trip -

3.12 Modifications to Reactor Core Isolation Cooling System Turbine Exhaust Trip Setpoint . .5 w ~

3.13 Additional ATHS Recirculation Pump Trip - b^@f "

4.0 ' DESCRIPTION OF OPERATIONAL PLANT SAFETY ENHANCEMENTS S.O CONCLUSIONS l

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