ML17202L227

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Summary of 900328 Meeting W/Util Re Approach to Station Blackout rule,10CFR50.63
ML17202L227
Person / Time
Site: Dresden, Quad Cities  
Issue date: 05/02/1990
From: Eng P, Olshan L
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
References
NUDOCS 9005110122
Download: ML17202L227 (29)
v • d • e


Text

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Docket Nos.

Licensee:

Facility:

SUBJECT:

UNITED STATES NUCLEAR REGULATORY COMMISSION 50-237, 50-249 50-?54, 50-265 WASHINGTON, D. C. 20555 May 2, 1990 Commonwealth Edison Company Dresden and Quad Cities MEETING

SUMMARY

-.MARCH 28, 1990 MEETING TO DISCUSS QUAD CITIES/DRESDEN* APPROACH. TO STATION. BLACKOUT On March 28, 1990, the NRC staff met with Commonwealth Edison Company {the*

licensee) to discuss the approach that the licensee intends to take to meet the Station Blackout Rule, 10 CFR 50.63, for Dresden and Quad Cities. A list of the attendees is provided in Enclosure 1. The material handed out at the meeting is provided in Enclosure 2.

The licensee presented the conceptual design of the system ihat would be provided at Dresden and Quad Cities to meet the Station Blackout Rule, 10 CFR 50.63.

The system consi~ts of a-new non-Cla~s lE diesel generator at each station capable of connecting to any of the four safety buses.

The sketches in that are labeled "Dresden Alter~ate AC" and "Quad Cities Alternate AC" show how the new diesel generator would be connected to the four buses.

The.

licensee's intention is that the new diesel Qenerator be similar in size and manufacturer to the existing diesel generators.

In addition, the existin9 swing diesel generator would be modified so that simultaneous feed could be provided to b9th units. With these modifications, the licensee would implement a diesel generator reliability program to justify using 0.95 for the "average" emergency diesel generator reliability'.

After a brief caucus, the staff made the following remarks regarding the

  • licensee's.proposal:
1. The proposal appears to satisfy t.he Station Blackout Rule.
2.

The licensee* should consider making the new diesel generator diverse from the existing diesel generator; i.e. different manufacturer.

3.

The staff will consider changing the "average" emergency diesel generator reliability to 0.95 {from 0.975 as specified in Regulatory Guide 1.155) if the new diesel generator at each site can handle the loss-of-off-site power safe shutdown loads for *both units {not coincident with a loss-of-coolant accident).

9005110122 900502 PDR ADOCK 05000237 P

PDC

-*.-:*.,,,,c**-, The licensee agreed to provide a revised submittal by April 30, 1990 that.

would address the staff's comments.

Enclosures:

As stated

~a.11-.~

Leonard N. Olshan, Project Manager Project Directorate III-2 Division of Reactor Projects - III IV, V and Special Projects Offi~f Nu. clear Reactor. Regulation

~f?2,,

Patricia L. Eng, rPr:r Manager Project Directorate III-2 Division of Reactor Projects - III IV, V and Special Projects Office of Nuclear Reactor Regulation

. cc:

See next page

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The licensee agreed to provide a revised submittal by April 30, 1990 that would address the staff's comments.

Enclosures:

As stated cc: See next page Distribution Dock_~t J.ile_~*

NRC & Local PDRs J. Sniezek J. Partlow PD #3/2 Reading R. Dudley L. Olshan P. Eng OGC E. Jordan ACRS (10)

J. Clifford ifa<AA ~Wa.

Leonard N. Olshan, Project Manager Project Directorate III-2 Division of Reactor Projects - III IV~ V and Special Projects Offic. -.::,1"4.tor egulation Patricia L. Eng, Projec Manager Project Directorate III-2 Division of Reactor Projects - III

  • IV, V and Special Projects Office of Nuclear Reactor Regulation DOCUMENT NAME:

MEETING

SUMMARY

- 3/28 SBOl}u Office: ~A II-2

.kjpM/PDIII-2 PM I-2 Surname:

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~LOlshan/tg PEn Date:

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Mr. Thomas J. Kovach Commonwealth Edison Company cc:

  • Mr. Stephen E. Shelton Vice President Iowa-Illinois Gas and Electric Company P. 0. Box 4350 Davenport, -Iowa 52808.

Michael I.* Miller, Esq.

Sidley and Austin

  • . One Fi~st National Plaza Chicago, 1llinois 60690 Mr. Richard Bax Station Manager Quad Cities Nuclear Power Station 22710 206th Avenue North Cordova, Illinois 6124?

Resident'lnspector u~ S. Nuclear Regulatory Commission 22712 206th Avenue North

  • *tordova, Illinois 61242 Chairman Rock Island County Board of Supervisors 1504 3rd Avenue Rock Island County Office Bldg.

Rock Island, Illinois 61201 -

Illinois Department of Nuclear Safety Office of Nuclear Facility Safety 1035 Outer Park Drive Springfield, Illinois 62704 Region~l Administratpr, Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road, Bldg. #4 Glen Ellyn, Illinois 60137 Quad Cities Nuclear Power.Station Units 1 and 2

Mr. Thomas J. Kovach Commonwealth Edison Company cc:

Michael I. Miller, Esq.

Sidley and Austin One First National Plaza

  • chicago, Illinois 60690 Mr. J. Eenigenburg Plant Superfntenderit Dresden Nuclear Power Station Rural Route #1 Merri s, I 11 in_oi s 60450 U. S. Nuclear Regulatory Commission Resident Inspectors Office Dresden Station Rural Route #1 Morris, Illinois 60450 Chairman Board of Supervisors of Grundy County
  • Grundy County Courthouse Morris, Illinois £0450 Regional Administrator Nuclear Regulatory Commission, Region III*

799 Roosevelt Road, Bldg. #4 Glen Ellyn, Illinoi~ 60137.

I lHnoi s Department.of Nuclear Safety Office of Nuclear Facility Safety 1035 Outet Park Drive Sp~ingfield, Illinois 62704 Dresden Nuclear Power Station Units 2 and 3

NRC R.

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QUAD CITIES/DRESDEN STATION BLACKOUT MEETING MARCH 28, 1990 Architze 1 Boyce Cra.ig Eng Gi 11 Knight NEisler Raual Rosa Toalston*

Zwolinski c

MEETING ATTENDEES ENCLOSURE 1 Commonwealth Edison J. Abel

z. Boxer
o. Galle M. Kluge T. Kovach V. Pareto M. Richter Other D~ Depa, IONS R.* Karimi, SAIC

ENCLOSURE 2 NRC Management Presentation Station

  • Blackout
  • March 28,. 1990 Introduction Purpose SBO Rule Evolution: CECo Resolution Objectives Alternatives Considered Optimum Resolution S cope/Benefits/Costs*

Schedule Summary Description of Other Alternatives

~*..

Purpose.

  • Provide an overview of Dresden
  • and Quad-Cities Station Blackout Modification Plans Obtain *NRC *Feedback Achieve concurrenc.e in principle regarding our approach Develop
  • Understanding
  • of Resolution Path for Certain Key Issues

Evolution of Dresden

  • and Quad-Cities SBO Station Blackout Rule 10CFRS0.63 *

(June 1988)

CECo Response to Rule (April 1989)

NRC Priority on Dresden/Quad-~ities (Sept

  • 1989)
  • CECo-NRC Meeting (October 1989)

Issues 8 *Hour vs 4

  • Hour Coping Capability 13 vs 12 (P2 to Pl) Offsite Power Independence
  • . 2/3 vs 1/3 (D to C)

DG Onsite Power Configuration

Evolution of Dresden and Quad-Cities SBO (Continued)

CECo~NRC Meeting

  • (Decem))er 1989}
  • Presented Alternatives in Response to 10/89 Issues Offsite Power Improvement Alternatives Onsite
  • Power Improvement Alternatives
  • NUMARC Letter (January 4,, 1990)

Additional guidance provided Supplemental Submittal Required

(~ubmittal dependent upon meeting outcome)

ACCEPTABLE STATION BLACKOUT DURATION CAPABILITY (HOURS)*

Emergency AC Power Configuration Groupb A

B c

D Unit "Average" EDG Reliabilityc Offsite Power Design d 0.915 0.95 0.915 0.95 0.915 0.95 0.915 Cwacteriltic Group Pl 2

2 4

4 4

4 4

P2 4

4 4

4 4

8 8

P3 4

8 4

8 8

16 8

  • v anations frOm these times will be considered by the staff if justification, including a cost-benefit analysis, is provided by the licensee. The methodology and sensitivity studies presented in NUREG-1032 (Ref. 2) are acceptable for use in this justification.

bsee Table 3 to determin~ emergency ac power configuration group.

Csee Regulatory Position 1.1.

dsee Table 4 to determine groups Pl, P2, and P3.

SBO Resolution Objectives Fully address the SBO Rule Minimize impact

  • on limited discretionary resources
  • Minimi,~'e impact*. on other resource
  • constrained regulatory initiatives Maximize *benefit to plant* operations Enhance. overall capability for safe shutdown
  • Alternatives Considered and SBO Rule

. Compliance Achieved New Non-Class *IE Diesel Generator Alternate AC per SBO Rule Remain Offsite

  • Power Group P2 Remain Onsite Power Group D New Class. IE Diesel Generator Alternate AC per SBO Rule Remain Offsite Power Group P2
  • Change to Onsite Power Group C.

New RAT/Onsite Power Improvements 4 Hour Coping Plant per SBO Rule Change to Offsite Power Group Pl Change to Onsite Power Group C

Optimum Resolution Alternate AC Scope Non-class lE Diesel Generator

- Meets SBO Rule for AAC Capable of carrying full shutdown loads for

.. blacked-out unit

- Capable of conne.cting to. any of four* safety buses Modify Existing S\\'fing Diesel Generator to provide* *simultaneous feed modification to. both units Results in the capability of any one of. the 3 diesels to feed both units Implement a diesel generator reliability*

program for the emergency and /\\AC diesel generators

Optimum Resolution* (Continued)

Alternate _ AC Benefits Minimum coping required Enhanced operator flexibility for safe shutdown following LOOP/SBO Alternate AC Costs Substantial Modification for AAC

$'10 to 20 Million estimated for.,

Dresden and, Quad-Cities Swing Diesel logic modification

$0.5 Million estimated for Dresden and Quad-Cities Diesel G~nerator reliability program

. EXISTING-NEW-DRESDEN ALTERNATE AC

.. 0 r

e*

EXISTING~

NEW-QUAD CITIES ALTERNATE AC..

I

1.!'1-

.)-

Preliminary Schedule Conceptual Design June - December. 1990 Detailed Design

. January - December 1991 Procurement June 1991 -

December 1992 Installation October 1992 - December -1994

- Two out'ages for each µnit Project' Completion

- -Testing Procedures Training 1995

Summary*

Multiple

  • Alternatives Evaluated Optimum Solution Selected Continuing dialogue. with*
  • NRC demonstrates our willingness to
  • be responsive CECo* will provide AAC in compliance with. the SBO Rule. and optimu~ cost/benefit '*..

CECo will evaluate any additional enhancements as *part of the IPE CECo will add procedures for utilization of AAC to enhance LOOP and SBO safe. shutdown CECo will implement a diesel generator reliability program to ensure onsite power availability

,\\

Items for* Discussion NRC. feedback regarding selected SBO resolution Required approach to implement a. diese.I generator reliability target of 0.95

  • Schedule considerations Extended OOS time for diesel generator due to AAC bac~up

Description of Other Alternatives Class lE Diesel Generator New RAT and Onsite Power

  • Improvements

f' New Class IE Diesel Generator Scope New Class lE Diesel Generator

  • Feeds

~,, single safety bus New safety-related building New dediCated auxiliaries (cooling pump, fuel pump, HV AC) * *

.~

\\

New

  • Class lE Diesel Generator Benefits Onsite pol.Ver independence between units Eliminates 2 unit* shutdown LCO on shared*

Diesel Generator

New Class 1 E Diesel Generator Costs Most complex modification of the alternatives considered Greater than $20 to $40

  • Mllllon per station Substanti~I cable,* buswork, piping and new Category 1 building Diesel Generator reliability of.975 required for all diesels Requi*res *coping analysis and procedures Ua-y not quallfy for AAC due to loa<fing and cross-.

tie concerns

r Four Hour Copin2 Scope Requires Offsite and Onsite

  • Power Improvements New reserve auxilliary transformer for each unit Provide shared diesel simultaneous feed modification
  • modification at Quad-Cities Requires a diesel generator loading study to verify capability to shut. down both units

\\..

~*

Four Hour Copin2 Benefits Achieves four hour category with.95 diesel generato*r reliability

  • Proyides second.,source of offsite power to all safety* buses (Pl Category)
    • Provides capability to* shut down. _botl_t un*its with any of three, diesel generators (EAC Group C)

Additional operator flexibility for safe shutdown following. a LOOP

Four -Hour Copin2 Costs Substantial Modification

$15 - $20 Million per station estimated cost Major work scope_

Requires, con:iplex coping. analysis and proced'ureS _

Backup do~umenta~ion and coping

  • procedures subject to continuing review Additional demands placed upon operators

EXISTING-NEW-.-

DRESDEN NEW RESERVE AUX TRANSFORMER 345 kV I 138 kV SWITCHYARD G3 G2

-.~

  • ~ *IC*

t*'

.e

EXISTING-*

NEW-QUAD CITIES NEW RESERVE AUX TRANSFORMER 345 kV SWITCHYARD G2 G1

,~.

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