ML17201M217
| ML17201M217 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities, 05000000 |
| Issue date: | 11/08/1988 |
| From: | Siegel B Office of Nuclear Reactor Regulation |
| To: | Bliss H COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML17201M218 | List: |
| References | |
| TAC-59089, TAC-59090, TAC-59132, TAC-59133, NUDOCS 8811150025 | |
| Download: ML17201M217 (5) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON. D. C. 20555 Docket Nos.: 50-237, 50-249, 50-254, and 50-265 Mr. Henry E. Bliss Nuclear Licensing Manager Corrmonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690
Dear Mr. Bliss:
November 8, 1988
SUBJECT:
COMPLIANCE WITH ATWS RULE 10 CFR 50.62 RELATING TO ALTERNATE ROD INJECTION (ARI) AND REACTOR COOLANT RECIRCULATION PUMP TRIP (RPT)
SYSTEMS FOR DRESDEN UNITS 2 AND 3 AND QUAD CITIES UNITS 1 AND 2 (TAC NOS. 59089, 59090, 59132, AND 59133)
The ATWS Rule (10 CFR 50.62," Requirements for Reduction of Risk from Anticipated Transients Without Scram (ATWS) Events for Light-Water-Cooled Nuclear Power Plant") requires improvements in the design and operation of commercial nuclear power facilities to reduce the likelihood of failure to shutdown the reactor following anticipated transients, and to mitigate the consequences of an ATWS event. The requirements for a boiling water reactor are to install an alternate rod injection (ARI) system, a standby liquid control system (SLCS), and a reactor coolant recirculation pump trip (RPT) system to be actuated for conditions indicative of an ATWS.
By letters dated September 30, 1987, and May 9*, 1988 you provided 1nfonnation concerning implementation of the ATWS Rule for the Dresden and Quad Cities Stations. The staff and Science Applications International Corporation, our consultant, have reviewed this infonnation and the updated FSAR infonnation on the docket related to ARI and RPT systems (SLCS has been previously evaludted by the staff). Based on this review, we have concluded that the ARI and RPT designs for the Dresden and Quad Cities units satisfy the requirements of the ATWS Rule except for diversity. A Safety Evaluation Report (SER), which contains the results of our review, is provided as an enclosure.
The staff has detennined that the Rosemount analog transmitters and trip units used for ARI/RPT and the reactor protection trip system, although different models, have insufficient differences to satisfy the diversity requirements of the ATWS Rule (SER, Section 4.4).
As a result, we have concluded that CECo should install an ARI/RPT system with instrument components that are diverse from the reactor protection system (RPS), for both the Dresden and Quad Cities Statio*ns, before restart foll owfng the next refueling outage for each unit.
This diversity requirement was the subject of a letter dated August 8, 1988 from T. E. Murley, Director, Office of Nuclear Reactor Regulation to Mr. L. w.
Eury, Senior Vice President, Carolina Power and Light.
In that letter the staff's position on the diversity requirement to satisfy the ATWS rule with regard to the Rosemount ARI and RPT analog transmitter trip unit {ATTU) circuit boards was provided. The letter further stated that compatible and fully
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November B~ 1988 qualified ATTU circuit boards are available from an alternate vendor and that these boards, if installed, would provide sufficient diversity between the ARI/RPT system and RPS.
In addition, the SER states that a preoperational test to verify the ARI functional time should be performed for Dresden (Section 4.1), and procedures should be provided for both Dresden and Quad Cities to assure proper verifi-cation that all related components are returned to normal status when the ARI system is reset (Section 4.14).
It is requested that within 30 days of receipt of this letter you provide a response with your proposed resolution of these remaining open items (1.e.
lack of diversity, preoperational testing, and additional procedures).
Enclosure:
_ As stated cc w/enclosure:
See next page Sincerely,
/S/
Byron Siegel, Project Manager Project Directorate III-2 Divis ion of Reactor Projects I II, _
IV, V and Special Projects
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- qualified ATTU circuit boards are available from an alternate vendor and that these boards, if installed, would provide sufficient diversity between the ARI/RPT system and RPS.
In addit1on, the SER states that.a preoperational test to verify the ARI functional time should be perfonned for Dresden (Section 4.1), and procedures should be provided for both Dresden and Quad Cities to assure proper verifi-cation that all related components are returned to nonnal status when the ARI system is reset (Section 4.14).
It is requested that within 30 days of receipt of this letter you provide a response with your proposed resolution of these remaining open items (1.e.
lack of diversity, preoperat1onal testing, and additional procedures).
Enclosure:
As stated cc w/enclosure:
See next page Sincerely,
~~~roject Manager Project Directorate Ill-2 D1vis1on of Reactor Projects - III, IV, V and Special Projects
Mr. Henry E. Bliss Conmonwealth Edison Company cc:
Michael I. Miller, Esq.
Sidley and Austin One First National Plaza
.Chicago, Il l1nois 60603 Mr. J. Eenigenburg Plant Superintendent Dresden Nuclear Power Station Rural Route #1 Morris, Illinois 60450 U. S. Nuclear Regulatory Commission Resident Inspectors Office Dresden Station Rural Route #1 Morris, Illinois 60450 Chainnan Board of Supervisors of Grundy County Grundy County Courthouse Morris, Illinois 60450 Regional Administrator Nuclear Regulatory Comnission, Region III 799 Roosevelt Road, Bldg. #4 Glen Ellyn, Illinois 60137 Mr. Michael E. Parker, Chief Division of Engineering Illinois Department of Nuclear Safety 1035 Outer Park Drive, 5th Floor Springfield, Illinois 62704 I
i Dresden Nuclear Power Station Units 2 and 3
Mr. Henry E. Bliss Comnonwealth Edison Company cc:
Mr. Stephen E. Shelton Vtce Prestdent Iowa-111,nots Gas and Electr1c Company P. 0. Box 4350 Davenport, Iowa 52808
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Mtchael I. Mtller, Esq.
Stdley and Austtn One First Nattonal Plaza Chicago, Illinois 60603 Mr. Richard Bax Station Manager Quad C1t1es Nuclear Power Station 22710 206th Avenue North Cordova, Ill1no1s 61242 Res1dent Inspector
- u. s. Nuclear Regulatory CofllTl1ssion 22712 206th Avenue North Cordova, 1111no1s 61242 Chatnnan Rock Island County Board of Supervisors 1504 3rd Avenue Rock Island County Office Bldg.
Rock Island,: Ill1no1s 61201 Mr. Mtchael E. Parker, Chief Divtston of Engineering Il11no1s Department of Nuclear Safety 1035 Outer Park Drtve, Sprtngfteld, Ill1no1s 62704 Regional Admtnistrator, Region III U. S. Nuclear Regulatory Conuntssion 799 Roosevelt Road, Bldg. #4 Glen Ellyn, Ill1no1s 60137 I
I Quad C1t1es Nuclear Power Statton Un1ts 1 and 2