ML19210D349
| ML19210D349 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 11/19/1979 |
| From: | Moody D YANKEE ATOMIC ELECTRIC CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| WYR-79-141, NUDOCS 7911260333 | |
| Download: ML19210D349 (9) | |
Text
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Telephone 617 366-9011 rwx 710-390 0739
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YANKEE ATOM 10 ELECTRIC COMPANY
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20 Turnpike Road Westborough, Massachusetts 01581 g r~s
.Yauxne November 19, 1979 United States Nuclear Regulatory Commission Washington, DC 20555 Attention: Office of Nuclear Reactor Regulation Mr. Harold Denton, Director
References:
(a) License No. DPR-3 (Docket No. 50-29)
(b) USNRC Letter to YAEC dated October 30, 1979 (c) YAEC Letter to USNRC dated October 18, 1979 (d) USNRC Letter to YAEC dated September 13, 1979
Dear Sir:
Subject:
Followup Actions Resulting from the NRC Staff Review Regarding The Three Mile Island Unit 2 Accident This letter is in response to your letter, Reference (b).
Our initial response with regard to our followup actions, Reference (c), was based on your letter of September 13, 1979, Reference (d), and our perception of the clarifications provided at the regional and topical meetings that we attended. Several deficiencies have been identified in the attachment to our response to Reference (d)..
We have revised the attachment to address these items, and are forwarding the revised attachment herewith.
We have not assessed any expansion to the scope of requirements which may be implied by of Reference (b) and reiterate that our current schedule is based on our understanding of your letter of September 13, 1979 Our schedule for completing each of the followup requirements is firm.
In the event of a delay in any of our implementation commitments, we will inform you of the degree of completion by January 1,1980, including a detailed justification for the delay.
We trust this information is satisfactory; however, if you have any further questions, please contact us.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY L
' N1 178 D. E. Moody Manager of Operations 7
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Sheet 1
of Revision 1 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS F09 FOLLOWUP ACTIONS Ch.
N Sec t.
Abbreviated No.
Title Requirement Implementation Commitment
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2.1.1 Emergency Power Supply Complete implementation.
Redundant capability to supply the
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pressurizer heaters from an offsite or from an emergency power source presently exists, and procedures are available. The breaker which provides the interface between the emergency bus and the non-emergency bus is an integral part of the emergency switchgear.
The motor operated block valve on the pressurizer relief line will be connected to an emergency power source by January 1, 1980.
The pressurizer solenoid-operated relief valve is already supplied by an emergency d-c power source, and the pressurizer level indication instrument channels are already supplied by the vital bus power source.
2.1.2 Relief and Safety Valve Submit program descrip-YAEC is closely following the EPRI Testing tion and schedule.
program, and presently intends to follow the industry commitment in regard to this test program.
It is anticipated that the program description and schedule will be available by January 1, 1980.
Complete test program.
The schedule for completion of the test program depends on the accept-ability and availability of the EPRI
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program.
Sheet 2
of 8
Revision 1 hTTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS CD CO Sect.
Abbreviated No.
Title Rpquirement Implementation Commitment
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nr 2.1 3.a Direct Indication of Complete implementation.
Yankee Rowe has always had an Valve Position electronic sound surveillance channel in the pressurizer compartment and it provides reliable indication to the operator that there is flow in the discharge pipe. However, Yankee intends to enhance this capability uith the installation of an acoustic accelerometer system. This will be installed during the 1980 refueling outage.
2.1 3.b Instrumentation for Develop procedures In response to I&E Bulletin 79-06A, Inadequate Core Cooling describe existing inst.
Yankee Rowa has already reviewed and revised plant procedures to provide a description of the existing instrumentation with regard to operator recognition of inadequate core cooling.
New level instrument Methods for the detection of reduced design submitted.
coolant inventory are presently being investigated by the Owners Groups and Yankee intends to submit a level instrument design by January 1, 1980, provided a satisfactory resolution is developed by this generic approach.
Sheet 3
of 8
Revision 1 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS CO Sec t.
Abbreviated c7 No.
Title Requirement Implementation Commitment re-Subcooling meter in-Yankee Rowe will install a primary stalled.
coolant saturation instrument.
A pur:hase order has been initiated and engineering design is in progress.
The instrument will be connected to core exit thermocouples and a narety grade pressure channel by January 1, 1980.
New level instrument Yankee intends to install a si.itable installed.
device for detection of reduced coolant level or adapt existing instruments to accomplish this purpose by January 1, 1981, depending on the resolution of the generic approach.
2.1.4 Diverse Containment Complete implementation.
Yankee is proceeding with a chan.;e to Isolation the design of the containment isolation system which will add a diverse initiation signal (SIAS),
automatically isolate all non-essential systems, and require deliberate operator action to reopen isolation valves after recetting of the isolation signal.
Every effort will be made to implement the design change by January 1, 1980, contingent upon delivery of new equipment and further input from Owners Groups.
Identification of essential and non-essential systems will be submitted by January 1, 1980.
Sheet 4
of 8
Revision 1 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS (NJ CO C::i=0 Q
Sect.
Abbreviated
{
No.
Title Requirement Implementation Commitment ne c:==s
($f53 2.1.5.a Dedicated H2 Control Description and imple-Yankee will provide a description C:::o Penetrations mentation schedule.
of the change and the implementation b!b55 schedule by January 1, 1980.
b Complete installation.
Yankee will complete implementation of 65Dgy the change by January 1, 1981.
l 2.1.5.c Recombiners Review procedures and Yankee does not have recombiners, bases for recombiner use.
Per Reference (b) of the cover letter, no action is required at this time.
2.1.6.a Systems Integrity for Immediate leak reduction Yankee will implement a leak reduc-High Radioactivity program.
tion program by January 1,1980.
Preventive maintenance Yankee will establish a preventive program.
maintenance program by January 1, 1980.
2.1.6.b Plant Shielding Review Complete the design Yankee will perform a preliminary review.
review of radiation and shielding design by January 1, 1980.
Implement plant modifi-Modifications to plant syntema will cations.
depend upon the resulta or the do:idn review and also upon the renult:, of other reviews currently being conducted in the SEP review.
Therefore, Yankee intends to factor implementation of shielding modifications into the SEP schedule, and will forward an identification of the modifications as soon as practicable after the completion of the shielding design review.
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Sheet 5
of 8
Revision 1 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS m
CO Sec t.
Abbreviated No.
Title Requirement Implementation Commitment ~~
CY h#
2.1.7.a Auto Initiation of Complete implementation As a result of the SEP ::i re im'-
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Auxiliary Feed of control grade, down review and the pont -TMI rrriew, Yankee had decided to inatai!.in entirely new auxiliary reedwater system.
A review of accident. an tlyses will be required to determine the mode of automatic initiation. The new system is being designed and the ordering of equipment is imminent.
The new system will be installed and connected to normal plant power systems on a schedule which is as expeditious as equipment delivery will permit.
The design wil1 ine1o1 an analysis for steam generator water
- hammer as required by the NHC letter of September 12, 1979.
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Complete implementation The new auxiliary feedwater system g;; of safety grade, will be connected to emergency power Sources on a schedule which will allow consideration of all loads requiring emergency power sources as a renuit of the SEP review, and thus permit optimization of emergency power source capacities. 2.1.7.b Auxiliary Feed Flow Complete implementation. The new auxiliary feedwater nystem Indication will have feed flow indications meeting the necessary safety-grade and power source requirements.
Sheet 6 of a Revision 1 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS v LV ~~~ Sec t. Abbreviated No. Title Requirement Implementation Commitment C' 2.1.8.a Post Accident Sampling Design review complete. Yankee will review its capability to ne obtain the necessary samples by January 1, 1980. A ggg]3 Preparation of revised If the review indicates that the plant procedures. has the capability to obtain the necessary samples, procedures will be h2I2j revised to implement the capability by January 1, 1980. M Implement plant modifi-If the review indicates that the plant g--]g cations. does not have the capability to obtain the necessary samples, Yankee intends ggggg to implement the necessary ) modifications in conjunction with the (--g SEP schedule. k Description of proposed A description of design modifications modification. will be submitted by January 1, 1980. 2.1.8.b High Range Radiation Installation complete. Yankee will install noble gas effluent Monitors monitors and high range radiation level monitors by January 1, 1931, subject to instrument qualification and availability. Procedures for estimating releases by the use of installed equipment will be available for review by the emergency plan review team. 2.1.8.c Improved Iodine Complete implementation. Yankeo presently has the capability to determine airborne iodine concen-Instrumentaton ation. Procedures presently in effect require the use of charcoal for iodine sampling and the use of the plant's GeLi detector for gamma ray energy a entrum analysis which can
...____.__u. ~ "" Sheet 7 of M Revision 1 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS tO CO Sect. Abbre-tated No. Title Requirement Implementation Commitment O' 2.1.9 Transient and Accident Complete analysis pro-To accomplish this action item, Yankee nc Analysis cedures, and training in Rowe will utilize generic work produced areas of: small break by the NSSS vendor in accordance with LOCA, inadequate core commitments made between the Werting-cooling, accidents and house Owners' Group and the Comminsion, q Implementation of emergency procedures transients. cggg3 and initiation of trainind programs will be accomplished expeditiously, consistent with the intent of ga t;g Reference (b) of the cover letter. In addition, within one year of pEngd completion of the generic analytical work Yankee Rowe will validate independently the applicability of gpgg ' the generic guidelines and an 11yaes for the Yankee Rowe plant. E---S O Yankee Rowe will install a containment
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Containment Pressure Installation complete. pressure monitor by January 1, 1981. Monitor Containment Water Level Installation complete. Yankee Rowe will install a conte.inment water level monitor by January 1, 1981. Monitor Containment Hydrogen Installation complete. Yankee Rowe will install a containment hydrogen monitor by January 1, 1981. Monitor RCS Venting Design submitted. This area is being investigated by the Westinghouse Owners Group and Yankee intends to follow the recommendations of the Owners Group. A venting design will be submitted by January 1, 1980, provided this schedule is consistent with the resolution of Owners C; oup recommendations.
Sheet 8 of C Revision 1 ~9 ATTACHMENT eacd IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS r sg) Sec t. Abbreviated k__j) No. Title Requirement Implementation Commitment f[ bEDE3 Installation complete. Provided the necessary equipment is
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("-D available, every effort will be made (< g to meet the scheduled date for ggg_ installation of the venting system. 2.2.1.a Shift Supervisor Complete implementation. Actions required in relation _to Responsibilities Shift Supervisors responsibilities will be implemented by January 1, 1980. 2.2.1.b Shift Technical Advisor Shift technical advisor Shift technical advisor requirements on duty. will be implemented by January 1, 1980. Complete training. Procedure and training requirements will be implemented by January 1, 1981. 2.2.1.c Shift Turnover Complete implementation. Yankee Rowe will review and revice Procedures plant procedures for shift turnover as necessary by January 1, 1980. 2.2.2.a Control Room Access Complete implementation. Yankee Rowe will establish the Control necessary controls to limit acceas to the control room by January 1, 1980. 2.2.2.b Onsite Technical Establish center. An onsite technical support center will Support Center be established at Yankee Rowe by January 1, 1980. A description of the permanent onsite technical support center will be submitted by January 1, 1980. 2.2.?.c Onsite Operational Complete implementation. An onsite operational support center Support Center will be established at Yankee Rowe by January 1, 1980. e S 9}}