ML19312D145
| ML19312D145 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 03/19/1980 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Parr O Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8003210309 | |
| Download: ML19312D145 (5) | |
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VIMOINIA Ex.ncTulc ann Pownn Cownwxy NICHNOND.VIntGINIA 202G3 March 19, 1980 Mr. Harold R. Denton, Director Serial No. 251 Of fice of Nuclear Reactor Regulation P0/FHT:baw Attn: Mr. O. D. Parrt Chief Docket No.
50-339 Light Water Reactors Branch 3 Division of Project Management U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Denton:
The purpose of this letter is to clarify our previous letters, (Serial No.
1C02 dated December 5,1979 and Serial No. 115 dated February 6,1980),
concerning the special test program for North Anna Unit 2.
' Test Program and Operator Involvement
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We will perform the tents that were discussed at the 236th meeting of the ACRS on December 11, 1979.
There will, then, be a total of nine (9) tests.
(The ninth test is divided into two parts.)
Test No. 7 (the. so-called " Blackout Test") was described in our letter Serial No.1002, Test No. 8 and 9A/9B are described in Attachment 1.
Administrative control of this program will be handled by a modification to our existing Startup Test proccdure that governs administrative control of facility testing from core loading through 100% full power testing. This modification will also contain the requirements for operator involvement.
'Ihe procedures for performing the opecial test program will be provided for staff review.
Testa 1 through 5 are similar in nature (that is, they all deal with natural circulation) and Test 6 does not impact the facility significantly (that is, no significant knowledge or training will result). Therefore, Tests 1 through 6 will be performed at least once.. All licensed shif t RO's and SRO's will
' participate in one of the first five (5) tests and observe at least 2 others sin.the series of Tests 1.through 6.
80082h0 369
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- Vlaorm Es.zctnic no Powra Coext to Mr. Harold R..Denton 2
Participate as used here means that personnel will be performing their normally assigned duties on the shift.
This includes manipulation of controls and monitoring.
Obse rve as used here means that personnel will not be actively involved l
in participation.
Alli icensed shift RO's and SRO's will participate in Tests 7, 8, and 9.
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' We expect that ~ this will require that tests be repeated several times.
'Please note that it may be possible to combine several tests because of common test conditions.- Any combining will not be permitted where the results
- could be' affected and a variance from our commitments on test program scope would result.
Low Pressure Test Program Criteria The staff developed a list of five criteria upon Which the proposed program should be reviewed.
We addressed those criteria in our letter Serial No. 115, dated February 8,1980.
With respect to Criterion 2, we are currently investigating training con-cerning two phase flow phenomena.
With respect to Criterion 3, a controlling document will be preapred to ad-minister the special testing program.
With respect to Criterion 5, we do not foresee that radiation levels created by the low power testing will preclude implementation of requirements re-sulting from the TMI-2 incident.
Additional Testing As requested in your letter of March 13, 1980, we will commit to obtain, when posst.ble, certain. baseline data about Reactor Coolant System (RCS)
~
N te, however, that pump speed will not be obtained since pressure-Jrops.
o we anticipate that this data would be utilized after an incident and the motors.would, in all probability, be inaccessible..Therefore, it is not meaningful to obtain pump speed.
Program' Flexibility
.We~ request that you permit suitable flexibility for program alteration in the event of an unsuccessful test or unanticipated events.
ACRS Letter '- March 11, 1980-We believe -that we have proposed a suitable test program and no further tests
- are required.,. We believe that our test-program covers proposed program will l
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- enhance, sufficiently, the operating knowledge and training for off-normal l~
RCS conditions.
' vino:Ni4 nECTRIC ANb PDWER COMMMY.70,
~Mr,. Harold R.-.Denton 3
~ In summary, we ' believe that' we have addressed your concerns and trust that you will be: able. to draf t an SER concerning these items.
Very truly.yours, 6'~f},.;heibt C. M. Stallings
.Vice President-Power Supply and Production Operations
' cc: Mr. James P. O'Reilly -
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. TEST 8-Establishment of' Natural Circulation from Stagnant Conditions.
Pu rpose Verify establishment of natural circulation from stagnant (no flow) condition in the'RCS..
Initial Conditions Reactor critical in the hot zero power test range.
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Reactor Coolant Pumps running.
Test Description.
Trip reactor coolant pumps Take the reactor to 1% power Monitor natural ~ circulation Restore initial conditions Test 9A '
Forced Circulatio,n Cooldown Purpose
' Determine an excore detector indicated power correction factor as a function of the average cold leg temperature.
Initial Condtions f
-Reactor Criticallat approximately 3% power Reactor Coolant pumps running Test Description Initiate a cooldown of the primary Maintain core power at approximately 3%
Initiate a heatup of the primary Develop,'if possible, correlations Test' 9B.
Boron Mixing and Cooldown Purpose
~
Verify boron mixing'during a.boration while in natural circulation and
-demonstrate the capability to cooldown and depressurize while in natural circulation.
Initial Conditions Reactorfis. critical at approximate 1p. 3% power Natural: circulation.has been established.
Test Description =
1 Initiate a boration-
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-Maintain the reactor critical--
l Sample RCS until boron, concentration ' stabilizes
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- Initiate"a~cooldown-
- Maintain 4thefreactor. critical.
/Af ter cooldown to approximately,450*F, take. the - reactor suberitical Return to hot no' load RCS temperature.
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