ML19338D219
| ML19338D219 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 09/04/1980 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Morisi A BOSTON EDISON CO. |
| References | |
| NUDOCS 8009220153 | |
| Download: ML19338D219 (4) | |
Text
.-.
UNITED STATES E
NUCLEAR REGULATORY COMMISSION N
e
.g aa WASHINGTON,0. C. 20555
.o#
September 4,1980
+...*
Docket No. 50-293 s
Mr. A. Victor Morisi, Manager Nuclear Operations Support Department Boston Edison Company M/C NUCLEAR 800 Boyl ston Street Boston, Massachusetts 02199
Dear Mr. Morisi:
Our letter of August 8,1979 requested certain analytical and test information regarding the adequacy of the station distribution sy:: tem.
Your responsa to this request (BECO letter 79-208, 10/16/79) was inadeouate since it did not address the specific itens of the enclosure as requested.
Please evaluate the enclosure and provide us with your written response within 45 days of receipt of this letter.
t Si ncerely, s[f
]
_TkL I Thomas Ippolito, Chief Operating Reactors Branch d2 Division of Licensing 1
Inclosure:
Reauest for Additional In forma tion c: w/ enclosure:
See next ca;;
8009220\\tf) l
Mr. A. Victor Morisi Boston Edison Company Septenber 4,1980 cc:
Mr. Richard D. Machon Pilgrim Station Manager Boston Edison Company RFD #1, Rocky Hill Road Plymouth, Massachusetts 02360 Henry Herrmann, Esquire Massachusetts Wildlife Federation 151 Tremont Street Boston, Massachusetts 02111 Plymouth Public Library North Street Plymouth, Massachusetts 02360 Resident Inspector c/o U. S. NRC P. O. Box 867 Plymouth, Massachusetts 02360 i
i i
r i
e P
+g+
. - =
1-PART B
~
July 1, 1980 REQUEST FOR ADDITIONAL INFORMATION
]
PILGRIM i.
ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES 1
1 f
Ref. 1: NRC letter (W. Gammill) to all power reactor licensees, dated August 8, 1979.
Ref. 2:
Boston Edison Co. letter (C. Carl Andognini)
{
to NRC (W. Gammill), dated.0ctober 16, 1979.
Ref. 3:
NRC letter (D. K. Davis) to Boston Edison Co.
(G. C. Andognini), dated June 3, 1977.
l 1.
Ref. A requested that all operating nuclear power station facilities i
review the adequacy of the station's electric distribution systems, This review is to determine analytically, in the event of an accident (LOCA) or I
anticipated transient (unit trip), if the onsite distribution system in conjunction with the offsite power sources has sufficient capacity and capability to automatically start and operate all required Class lE loads i
^
within the equipment's voltag'e ratings.
In addition, the NRC has recom-r ' f
}
mended the guidelines in Ref. l' be followed in the voltage analyses and to j
meet certain requirements, specifically:
(a) To automatically start, as well as operate, all required Class lE 4
loads within its required voltage ratings.
(b).The maximum voltage rating of the Class lE equipment must not I-be exceeded.
-(c) There should be no manual load shedding to prevent unacceptable voltage at the terminals of all Class lE equipment.
(d) The voltage analysis must show that there will be no spurious tripping from the offsite sources.
.l
_2_
(e) Compare the effect of starting and running a large Non-Class lE load on all Class 1E equipment with the required voltage range for normal operation.
(f) If any sequential loading is required to assure the voltage is within the required voltage limits at the terminals of all Class lE equipment, the NRC must be notified.
(g) The adequacy of the onsite distribution of power from the of fsite circuits shall be verified by test to assure the analysis results are valid.
(h) Review the electric power systems to determine if any events or conditions could result in the simultaneous loss of both offsite power circuits as required by GDC-17.
I The above NRC requirements are separate and in addition to the NRC Staff Position requirements of the June 3, 1977 letter (Ref. 3}.
The submittals stated in Ref. 2 do not adequately respond to the above NRC requirements (Ref. 1).
Submit adequate voltage analysis documentation to meet the NRC requirements on the adequacy of station electric distribution systems voltages.
I
-