ML19210D344
| ML19210D344 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 11/19/1979 |
| From: | Moody D Maine Yankee |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19210D345 | List: |
| References | |
| WMY-9-129, NUDOCS 7911260327 | |
| Download: ML19210D344 (2) | |
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ENGINEERING OFFICE WESTBoRO, MASSACHUSETTS 01551 617-3G6-9011 O
WMY 79-129 November 19, 1979 United States Nuclear Regulatory Commission Washington, DC 20555 Attention: Office of Nuclear Reactor Regulation Mr. Harold Denten, Director
References:
(a) License No. DPR-36 (Docket No. 50-309)
(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, Refercace (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 our response to Reference (d).
There items have been addressed in a revision to the attachment to Reference (c) and forwarded herewith (see attachment 1).
We have not assessed any expansion to the scope of requirements which may be implied by Enclosure 1 of Reference (b) and reiterate that our current schedule is based on our understanding of your letter of September 13, 1979 Due to Maine Yankee's operating schedule which includes a refueling outage beginning January 15, 1980, many plant hardware modifications have been l
focused to coincide with the plant shutdown. Due to the regional power I
considerations and the time of year (see attachment 2), a shutdown prior to I
that date would impose an unnecessary burden on the local consumers.
I C
7911260 P
United States Nuclear Regulatory Commission November 19, 1979 Page two 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, MAINE YANKEE ATOMIC POWER COMPANY D. E. Moody Manager of Operations DEM/fb Enclosure l30}
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Sheet 1
of 10 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS OD Sec t.
Abbreviated
~J' No.
Title Requirement Implementation Commitment C2?
2.1.1 Emergency Power Supply Complete implementation.
Redundant capability ta :mppiy
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pressurizer heaters from an orraite or re; emergency power source presently exists.
Additional procedure c:g development or modifications to existing procedures relative to heater operation, if necessary, will be accomplished by January 1, 1980.
The M.O.V. Block valves on the pressurizer relief lines are presently
.:upplied by an emergency power source.
The Pressurizer solenoid operated relief valve will be connected to an emergency power Lource during the refueling shutdown which will commence on or about January 15, 1980.
Pressurizer level instrumentation is presently supplied by an emergency power source.
2.1.2 Relief and Safety Valve Submit program descrip-It is presently anticipated that a Testing tion and schedule.
program description and schedule foa Relief and Safety Valve testing will be available for submittal on or bufore January 1, 1980. This schedule for submittal assumes that the EPRI test program currently under development will be found acceptable, and is available.
Sheet 2
of 10 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS Sect.
Abbreviated No.
Title Requirement
, Implementation Commitment N
CD Complete test program.
The schedule for complet. ion or th"
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test program depends upon the progress of the EPRI program.
2.1 3.a Direct Indication of Complete implementation.
Maine Yankee is presently scheduled Valve Position to shutdown for refueling on oa about January 15, 1980 for an estimated 5 week period.
It is our intention to complete the installation of an acoustic acceleromoter syntem during that period.
2.1 3.b Instrumentation for Develop procedures As described in Maine Yankee's Inadequate Core Cooling describe existing inst.
response to I&E Bulletin 79-06B, operating procedures have been reviewed and revised as necessary to:
a.
make the operators aware of the possibility of forming voids in the primary coolant sysNm large enough to compromise core cooling capability, especially during natural circulation.
E2
Sheet 3
of 10 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS Sec t.
Abbreviated a
No.
Title Requirement Implementation Commitment or7 O
2.1 3.b b.
provide appropriate onorator
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action to prevent the form.ition of e=gg such voids, and c.
specify additional operator action necessary to enhance core cooling in the event such voids are formed.
Coupled with the above procedural modifications which have already been accomplished, Maine Yankee will provide a description of its existing instrumentation by January 1, 1980.
New level instrument Methods for the detection of reduced design submitted.
coolant level 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.
9
Sheet 4
of 10 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS 9
ma w
Sect.
Abbreviated (P 9 Cr No.
Title Requirement Implementation Commitment W.
y
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Subcooling instrument in-Maine Yankee is presently evaluating G
2) stalled.
proposals on subcooling instruments and related equipment.
Assuming that g
the equipment selected is available g
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for delivery, Maine Yankee intenfr. to U
perform the installation daring ti,e refueling shutdown which wi11 corn. :nce b
on January 15, 1980.
New level instrumert Maine Yankee intends to inntall a installed.
suitable device for detection of reduced coolant level, or adapt existing instruments to accomplish this purpose by January 1, 1981 depending upon the resolution of thd new generic approach.
2.1.4 Diverse Containment Complete implementation.
An Engineering effort is currently in Isolation progress to provide an Engineering design change which will make automatic, those interim manual actions as described in Maine Yan%ee's response to I&E Bulletin 79-Of>3 relative to containment inolation actions. Maine Yankee will provide evaluation by January 1, 1980.
It is Maine Yankee's intent to complete these changes during the refueling outage starting Jsnuary 15, 1980.
Sheet 5
of 10 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS N
[h)
Sect.
Abbreviated No.
Title Requirement Implementation Commitment 2.1.5.a Dedicated H2 Control Description and imple-Maine Yankee will meet schedule.
cr Penetrations mentation schedule.
N
Complete installation.
Maine Yankee will meet schedule.
2.1.5.c Review procedures and Maine Yankt does not have recombiners.
bases for recombiner use.
Additionally, per Ref. (b) of cover letter, no action is required at this time.
2.1.6.a Systems Integrity for Immediate leak reduction Maine Yankee will implement a le:ik High Radioactivity program.
reduction program by January 1, 1980.
CE55$
M Preventive maintenance Maine Yankee will establish a pre-program.
ventative maintenance program by 6SEI)
January 1, 1980.
ggggj 2.1.6.b Plant Shielding Review Complete the design Maine Yankee will perform a pre-k252) review.
liminary review of radiation and shielding design by January 1, 1980.
bESE3 C3 Implement plant modifi-Modifications to plant systems will q__g cations.
be dependent upon the results of the ggq_
design review. The schedule for completion of the modifications will then be consistent with any associated constraints imposed by labor and material availability, with the objective of completion of the modifications by the January 1, 1981 date.
Sheet 6
of 10 ATTACHMENT
~
IMPLEMEN1aTION OF REQUIREMENTS FOR FOLLOWUP ACTIONS A
D CD Sec t.
Abbreviated No.
Title Requirement Implementation Commitment C'
2.1 7.a Auto Initiation of Complete irolementation It is Maine Yankee's intention to
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Auxiliary Feed of control grade.
implement this requirement during the January 15, 1980 refueling nhutdown provided that the safety analyais gives assurance that no degradation of safety will occur.
Complete implementation It is Maine Yankee's intention t n'
of safety grade.
upgrade to safety grade equipment at the first scheduled cold chutdown M
following receipt of equipment.
W 2.1.7.b Auxiliary Feed Flow Complete implementation.
Maine Yankee intends to complete.
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Indication the installation of Auxiliary Feed bESE0 Flow Instruments during the outage 6
9 starting January 15, 1980.
It is Maine Yankee's intention to bEhEd upgrade to safety grade equipment at g
g the first scheduled cold shutdotin p
g following receipt of equipment.
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e
Sheet 7
of 10 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS
<m Sec t.
Abbreviated c:)
No.
Title Requirement Implementation Commitment 2.1.8.a Post Accident Sampling Design review complete.
Maine Yankee will complet e a ro v i ew o f C7; its capability to obtain Ihe neo" tary
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samples by January 1, 1980 Preparation of revised If the review to be completed in Item procedures.
2.1.8.a-(l) indicates that the capability exists to obtain the desired samples, procedures will then be revised to implement that q
capability by January 1, 1980.
gggg Implement plant modif1-If it is determined throuCh the review NEEdi cations.
the sampling capability does not exist, plant modifications will be f
engineered which will Cive that ggggg capability, in accordance with the January 1, 1981 requested date for k---)
completion.
Description of proposed Maine Yankee will submit a description 6
9 modification, of the proposed modifications by
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9 January 1, 1980.
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Sheet 8
of 10 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS t.n ma Sect.
Abbreviated No.
Title Requ.rement Implementation Commitment Cr 2.1.8.b High Range Radiation Installation complete.
Maine Yankee will install noble gas effluent monitors and high r.m.m Monitors
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radiation level monitora by.lanuary 1, 1981, subject to instrument qualification and availability.
Procedures for estimating releanes by the use of installed equipment will be q
available for review by the emergency plan review team.
N
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2.1.8.o Improved Iodine Complete implementation.
Fhine Yankee presently has the.capa-bility to determine airborne iodine hggg-j Instrumentation concentration.
Proceduren prenently b
3 in effect require the une or charcoal for iodine sampling and the une of the b5DEO plants GeLi detector for gamma ray energy spectrum analysis which can discriminate iodine from noble gasses.
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2.1.9 Transient and Accident Complete analysis pro-To accomplish this action item, Maine Analysis cedures, and training ir.
Yankee will utilize generic work areas of:
small treak produced by the NSSS vendor in accor-LOCA, inadequate core dance with commitments made between the cooling, accidents and Combustion Engineering Owner'o Group transients.
and the Commission.
Implemontation of emergency procedures and initiation of training programs will be accomplished expeditiously, consistent with the intent of Reference (b) of the cover letter.
In addition, within one year of completion of the generic analytical work Maine Yankee will validate independently the applicability of the generic guidelines and analyses for the Maine
Sheet 9
of 10 ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS 4m CD Seat.
Abbreviated
, No.
Title Requirement Implementation Commitment
[hI W
Containment Pressure Installation complete.
Maine Yankee will install Monitor a containment pressure monitor or adequate range by January 1, 1931.
Containment Water Level Installation.omplete.
Maine Yankee will install a containment Monitor water level monitor by Janum.
1, 1981.
Containment Hydrogen Installation complete.
Maine Yankee will install a Monitor hydrogen monitor by January 1, 1981.
c___C N
RCS Ventir.3 Design submitted.
This area is being investigated by the Combustion Engineering owners group at f55$$
this time. Maine Yankee intends to gaggy follow the recommendations made by the e--
owners group.
A venting system design (EhER will be submitted by January 1, 1980 g
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provided that this schedule is found to be consistent uith the reso1>aion ggpg of Owners Group recommendatie.s.
Installation Completed.
The venting system will be installed k__j) at the first scheduled outage
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opportunity after the design is complete and the associated equipment is available.
2.2.1.a Shift Supervisor Complete implementation.
Actions required relative to Shift Responsibilities Supervisors responsibilities will be implemented by January 1, 1980.
O S
Sheet 10 of 10 __
ATTACHMENT IMPLEMENTATION OF REQUIREMENTS FOR FOLLOWUP ACTIONS N
[h]
Sec t.
Abbreviated No.
Title Requirement Implementation Commitment 2.2.1.b Shift Technical Advisor Shift technical advisor Shift Technical Advisor requirements on duty.
will be implemented at Maine Yankee by re' January 1, 1980.
Complete training.
Procedures and training requiremonts will be completed by January 1, 1981.
2.2.1.c Shift Turnover Complete implementation.
Maine Yankee will review and revice plant procedures for shift turnover as necessary by January 1, 1980.
2.2.2.a Control Room Access Complete implementation.
Maine Yankee will establish the Control necessary controls to limit access to the control room by January 1, 1980.
2.2.2.b Orcaite Technical Establish center.
An onsite Technical Support Center will Support Center be established at Maine Yankee by January 1, 1980. Description of the permanent center will be submitted by January 1, 1980.
2.2.2.c Onsite Operational Complete implementation.
An onsite Operational Support Center Support Center will be established at Maine Yankee by January 1, 1980.
.