ML19339A949
| ML19339A949 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 09/26/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO., NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| TASK-03-10.B, TASK-3-10.B, TASK-RR NUDOCS 8011060049 | |
| Download: ML19339A949 (4) | |
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September 26, 1980 Docket No. 50-213 Mr. W. G. Counsil Vice President Nuclear Engineering and Operations Connecticut Yankee Atomic Power Company Post Office Box 270 Hartford, Connecticut 06101 Dear Mr. Counsil RE:
SEP TOPIC 111-10.B REACTOR COOLANT PUMP FLYllHEEL INTEGRITY Enclosed is a copy of our evaiuation of Systematic Evaluation Program Topic 111-10.8, Reactor Coolant Pump Flywheel Integrity. This assessment compares your facility, as described in Docket No. 50-213, with the criteria currently used by the regulatory staff for licensing new facilities. Please inform us if your as-built facility differs from the licensing basis assumed in our assessment within 60 days of receipt of this letter.
This evaluation wiil be a basic input to the integrated safety assessment for your facility unless you identify changes needed to reflect the as-built conditions at your facility.
This topic assessment ;..ay be revised in the future if your facility design is changed or if NRC criteria relating to this topic is modified before the integrated assessment is completed.
Sincerely, (g
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ennis M.
utchfield Chief Operating Reactors Branch #5 Division of Licensing
Enclosure:
O' Completed SEP i
Topic III-10.B cc w/ enclosure:
See next page 80110 6o O y
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Mr. W. G. Counsil September 26, 1980 CC U. S. Environmental Protection Day, Berry & Howard Counselors at Law Agency One Constitution Plaza Region 1 Office Hartf ord, Connecticut 06103 ATTN: EIS COORDINATOR JFK Federal Building Boston, Massachusetts 02203 Superintendent Haddam Neck Plant Resident Inspector RFD #1 Haddam Neck Nuclear Power Station Post Office Box 127E East Hanpton, Co< necticut 06424 c/o U. S. NRC East Haddam Post Of fice Mr. James R. Hinnielwright East Haddam, Connecticut 06423 Northeast Utilities Service Company P. O. Box 270 Hdrtf ord, Connecticut 06101 Russell Library 119 Broad Street Middletown, Connecticut 06457 Board of Selectnen Town Hall Haddam, ;cnnecticut 06103 Connecticut Energy Agency ATTN: Assistant Director Research and Policy Development Department of Planning and Energy Policy 20 Grand Street Hartf ord, Connecticut 06106 Director, Technical Assessment Division Office of Radiation Prograns i
(AW-459)
U. S. Environnental Protection Agency Crystal Mall #2 Arlington, Virginia 20460 O
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r SYSTEMATIC EVALUATION PROGRAM PLANI SYSTEMS / MATERIALS HADDAM NEC; PLANT f
TOPIC 111-10.B PUMP FLYWHEEL INTEGRITY The safety objective of this review is to assu. e that the integrity of the primary reactor coolant pump flywheel is maintainec to prevent failure at normal operating speeds and speeds that might be reached under accioent conditions and thus precluoe the generation of missiles.
Information for this assessment was obtained from the Facility Descrip'. ion and Safety Analysis Report (FDSAR), Technical Specifications and Inservice Inspection 30,1974, July 30,1975, Reports by Westinghouse Electric Company dated January August 6,1976, January 12, 1978, anc March 18, 1979, for the Haddam Neck plant.
The basis f;,r the review is to determine compliance with the recommendations of Regulatory Guide 1.14, " Reactor Coolant Pump Flywheel Integrity." This guiae descriDes and recomends a method acceptacle to the NRC staff for implementing General Design Criterion 4, " Environmental and Missile Design Bases" of Appendix A to 10CFR Part 50, with regard to minimizing the potential for f ailure of the flywheels of the reactor coolant pump motors.
The first There are two parts to the recomendations of Pegulatory Guice 1.14.
part is related to the evaluation of materials of construction, design, fabrica-tion, roof testing, and pre-service inspecti >n of the pump flywheels for af ter January 1,1976. The construction permit submittals docketed on o' second part is concerned with tne evaluation of procedures useo for the inservice inspection of pump flywheels for ill plants af tar January 1,1976.
The regulatory position for the inservice inspection of the recctor pump tion of flywheels for the Haddam Neck plant is that the inservice in?p;:
eacn flywneel should be performed in compliance with the recomendation of Section D.2 of Regulatory Guide 1.14 as follows:
In-place volumetric examination of areas of higher stress a.
concentration at approximately three year intervals; Surf ace examination of all exposed surfaces and a complete b.
volumetric examination at approximately ten year intervals; The examination procecures should ;omply with Subarticle c.
k d.
Acceptance criteria shoulc D : that the lowest critical speed is calculated to be twice the normal operating speed, and
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.n V Shoulo the examination indicate an increase in flaw size e.
greater than predicted for the service life, the results should be submitted to the regulatory staff for evaluation.
The design of the reactor pump is shown in Figure 5.1.4-4 of the FOSAR and the flywnc..I is cescribed in Section 5.1.4.2 of the FDSAR as follows:
A flywheel, mounted above the motor rotor, provides the inertia necessary to maintain flow for a period sufficient to dissipate the stored and decay heat in the core upon loss of alternating The inertia of the rotating assembly is approxi-current power.
mately 45,000 lb-ft.
The flywheel has six pawls mounted on its outer rim in such a way that when the flywheel stops, the pawls drop and engage ratchet teeth on a stationary ring. This prevents reverse rotation of the pump and limits backflow of reactor coolant througn the pump.
The Inservice Inspection Program for the Haddam Neck plant is described in Table 4.10.1 of the Technical Specifications. Referring to item No. 7.1 in the taDle, one different flywheel shall be examined visually and 100% volumetrically at every other refueling shutdown.
Details of the procedures for examination are describec in Section H (151-8 and 151-41) of the Inservice Inspection Report (Westingnouse) datec March 18, 1979.
We conclude from our review that the Inservice Inspection Program for the reactor coolant pump flywheel for the Haddam Neck plant does not comply with the recommend-ation of Regulatory Guide 1.14, " Reactor Coolant Pump Flywneel Integrity." We recommend tnat in-place volumetric examination of areas of higner stress concentration be perfornec on all flywheels at approximately three-year intervals and that surface examination of all exposed surfaces and a complete volumetric examination be concucted on all flywheels at approximately ten-year intervals.
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