ML20235X392
| 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: |
| References | |
| FOIA-87-643 NUDOCS 8707240168 | |
| Download: ML20235X392 (2) | |
Text
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UNITED STATES fi l',
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NUCLE AR REGULATORY COMMISSION i$
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,E WASHINGTON, D. C. 20$$6 k
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July 20,1987
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NOTE T0:
Charles Tinkler 1
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Tsung Ming Su
- 0. P. Chopra g,
FROM:
Ashok Thadani
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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
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F. Rosa / J. Knight d
L. Shao S. Varga g 3
R. Weisman p
A707240160 070721 1
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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' Safety Enhancement Program Plant and Operational Changes 1.4 2.0 OVERVIEW 0F SAFETY ENHANCEMENT PROGRAM Q
2.1 Background
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2.2 Safety Enhancements l
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3.0 DESCRIPTION
OF SPECIFIC PLANT SAFETY ENHANCEMENTS 3.1 General Considerations N d ' '
3.2 Installation of a Direct Torus Vent System (DTVS)
I MIb4 3.3 Containment Spray Header Nozzles 3.4 Additional Sources of Hater for RPV Injection and Containment Spray
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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 7
Facilities c /t A rA Qts A)
Automatic Depressurization System logic Modifications' p m a n.!,
e 3.9 1 l, t WW T h
I 3.10 Addition of Enriched Boron to Standby Liquid Control System.,3.4
%e-3 14 3.11 ATHS f eedwater Pump Trip -
3.12 Modifications to Reactor Core Isolaticn Cooling System Turbine Exhaust Trip Setpoint.
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3.13 Additional ATHS Recirculation Pump Trip
4.0 DESCRIPTION
OF OPERATIONAL PLANT SAFETY ENHANCEMENTS
5.0 CONCLUSION
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UNITED STATES 8
NUCLEAR REGULATORY COMMISSION o
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. Shao S. Varga _ W i R. Weisman l
-82M?!d9 9Z2HL, 27 m.
___.____g XX
% towre 1
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1.0 INTRODUCTION
~
1.1 Purpose of Report 1.2 Scope of Report i
j 1.3 Safety Enhancement Program Goals f
Safety Enhancement Program Plant and Operational Ch'anges 1.4 OVERVIEH OF SAFETY ENHANCEMENT PROGRAM 2.0
2.1 Background
2.2 Safety Enhancements DESCRIPTION OF SPECIFIC PLANT SAFETY ENHANCEMENTS 3.0 3.1 General Considerations b'd
^ f Installation of a Direct Torus Vent System (DTVS) 3.2 N/b+
3.3 Containment Spray Header Nozzles Additional Sources of Water for RPV Injection and Containment 3.4 Spray
'T,w h 44/ C4 J%
Diesel Fire Pump for RPV Injection and Containment Spray MA4 3.5
'7 3.6. Diesel Pump Fire Pump Fuel Oil Transfer System C/M/Y^'
MIbw[(d of*
3.7 Backup Altrogen Supply System BlackoutDieselGe(eratorIncludingProtectedInstallation 3.8 c.dAjrrA 66
-H',
Facilities Automatic Depressurization System Logic Modifications'i 3.9 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
_ _ ____ ______________ y