ML19211A376
| ML19211A376 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 11/30/1979 |
| From: | Parr O Office of Nuclear Reactor Regulation |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7912180122 | |
| Download: ML19211A376 (5) | |
Text
...
f* **%cy
+
UNITEC TATES EI)g-f()o NUCLEAR REGULA e ORY COMMISSION E
WASHINGTO'. D. C. 20555
- .M
% '$N /p 'p
- l
..,; A.
%.v Docket No..
50-339 Mr. W. L. Proffitt Senior Vice President - Power Virginia Electric and Power Company P. O. Box 26666 Richmond, Virginia 23261
Dear Mr. Proffitt:
SUBJECT:
CLARIFICATION OF STAFF POSITION ON ELECTRICAL PROTECTION OF CONTAINMENT PENETRATIONS FOR NORTH ANNA POWER STATICN, UNIT 2 In a letter to you dated August 3,1979, we advised you of our position regarding the electrical protection of containment penetrations for North Anna Power Station, Unit 2 and requested additional information.
In response to our request you submitted, in a letter dated October 5,1979, information regarding this matter.
We have reviewed the information and have determined further clarification of our requirements is necessary. The intent of this letter is to clarify our letter of August 3,1979 by relating our requirements to those recently applied to Diablo Canyon, Units 1 and 2.
In discussions with your repre-sentatives, we indicated that VEPCO could use the requirements for Diablo Canyon's containment penetration devices and the utility's response as an example of acceptable design.
These requirements are:
1.
Identify each type of electrical circuit that penetrates the containment.
2.
Describe the primary and backup overcurrent protective systems provided for each type of circuit identified in Item 1.
The description of the primary overcurrent protective system that will be installed and operable prior to issuance of the operating license shall be provided in the response to this request. The description of the backup system and its design shall be submitted for review not 1597 295 7 912180 / b b a
Mr. W. L. Proffitt '
later than six months from the date of issuance of the operating license and shall be installed and operable prior to completion of the first refueling outage.
3.
Describe the fault current-vs-time regime for which the primary anc proposed redundant backup overcurrent protective systems are designed.
This information for the backup system can be submitted at the same time as the information for Item 2.
4.
Describe the maximum fault current-vs-time regime for which the penetrations are designed and qualified.
In this regard, the Diablo Canyon applicant was required to ensure that the maximum temperature when combining the penetration temperature rise due to overcurrent with the peak LOCA temperature did not exceed tne maximum temperature tne penetration was qualified for.
In calculating the temperature rise the applicant was further required to assume that no heat generated by fault current passing through the penetration was lost from the pene-tration.
5.
Provide curves that show coordination between Items (3) and (a) for each type of circuit identified in Item 1.
These curves shall demon-strate that the fault-current vs time relationship to which the penetrations are qualified is not exceeded.
6.
The elements of the containment penetration electrical protective system shall have the capability for periodic test and calibration.
The coordination between primary and backup elements shall be periodi-cally tested. Where fuses are used as protective elements in the design, provisions shall be made for testing on a periodic basis to assure their continued capability to interrupt the fault current with-in the required time.
7.
Where external control power is used for actuating the protective systems, signals for tripping primary and backup system devices shall be independently derived and the signal handling and actuating circuits for each primary and backup device shall be independent, physically separated to the extent practical and energized from separate sources.
In prior discussions with your representatives, they have stated that they might not have space to install separate, redundant racks.
In response we stated that we would allow primary devices and redundant backup devices to be installed in the same set of racks provided they were separated where practical such that both devices would not be subject to loss or damage by the occurrence of a common physical event.
1597 296
(
Mr. W. L. Proffitt ~
Accordingly we request that you amend four r3AR to clearly state your intent regarding compliance with our position as stated above.
Please inform us within seven days of receipt of this letter of your schedule for providing the information described above.
Sincerely,
. fc-lan D. Parr, Chief Light Water Reactors, Brancn No. 3 Division of Project Management cc:
See Next Page 1597 297
Mr. W. L. Proffitt cc: Mr. Anthony Cambaradella Cl arence T. Ki pps, Jr.,
s.;.
Office of the Attorney General 1700 Pennsylvania Avence, 11 South 12th Street - Room 308 Washington, D. C.
20005 Richmond, Virginia 232 19 Ca rroll J. Sa vage, Es q.
Richard M. Foster, Esq.
1700 Pennsyi vani a Aver.:.e,.'...s.
211 Stribling Avenue Washington,D. C.
20L0c Charlottesville, Virginia 22903 Mr. James C. Dunstan Michael W. Maupin, Esq.
State Corporation Corm:ssion Hunton, Williams, Gay & Gibson Conr.onwalth of Vi rgini a P. O. Box 1535 Blandon Building Richmond, Virginia 23212 Richmond, Vi rginia 2320 '
Mrs. June Allen Alan S. Rosentha!, Esa.
412 Owens Drive Atomic Safety and Licens:r.g /. ceal Ecarc Hunt sville, Alabama 35801 U.S. Nuclear Regulatory Ccc.aiss:cn Washington, D. C.
20555 Fr. James Torson 501 Leroy Michael C. Farrar, Esq.
Socorro, New Mexico 87801 Atomic Safety ana L:cens:ng Acreal Eoard U.S. Nuclear Regulatory Cccoission Mrs. Margaret Dietrich Washington, D. C.
20555 Route 2, Box 568 Gordonsville, Vi rginia 22942 Dr. John H. Buck Atcaic Safety and Licensinc,greal warc Willi an H. Rodgers, Jr., Esq.
U.S. Nucl ear Reg ulatory L;..:.: ssi cn Georgetown University Law Center Washington, D. C.
2055c 600 New Jersey Avenue, N.W.
Washington, D. C.
20001 Atomic Safety anc Licensing maara a::e:
U.S. Nuclear Reg ulatcry Carm ssion Mr. Peter S. Hepp Washington, D. C.
2U555 Executive Vice President Sun Shipping & Dry Dock Company Mr. Michael S. Ki cd P. O. Box 540 U.S. Nuclear Regulatory Ccmiss:or.
Chester, Pennsylvania 19013 P. O. Box 128 Spotsivania, Vi rgini a 22553 Mr. R. B. Briggs Associate Cirector Dr. Paul W. Purdom 110 Evans Lane Cepartment of Civil En gi r.ee r: n g Oak Ridge, Tennessee 37830 Drexel University Philadel phia, Pennsyl vania 19104 P00R ORIGIEL
Mr. W. L. Proffitt cc :
Dr. Lawrence R. Quarles Apartment t;o. 51 Kenda l-a t-Lcngwood V,ennett Square, Pennsyl vania 19343 Mr. Irwin B. Kroot Citizens Enertjy Forua P. O. Box 138 McLean, Vi rginia 22101 James B. Dougherty, Esq.
Potomac Al1iance 1416 S Street,
..W.
Washington, D. C.
200G9 1597 299
?00R ORG hAL
.