ML19263D303
| ML19263D303 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 03/14/1979 |
| From: | Counsil W NORTHEAST UTILITIES |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-08-04, TASK-8-4, TASK-RR NUDOCS 7903270362 | |
| Download: ML19263D303 (10) | |
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P O BOX 270 HARTFORD. CONNECTICUT C6101 7,',9 ' '.d, ", e,' ~l,' 7. m, (203) 6E6911 m,
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March 14, 1979 Docket No. 50-245 Director of Nuclear Reactor Regulation Attn: Mr. D. L. Ziemann, Chief Operating Reactors Branch #2 U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Reference:
(1)
D. L. Ziemann letter to W. G. Counsil dated December 8,1978.
Gentlemen:
Millstone Nuclear Power Station, Unit No.1 Systematic Evaluation Program (SEP)
Topic VIII-4 Electrical Penetrations In Reference (1), the NRC Staff stated that their review of the dockets had indicated the need for additional information on the above-captioned SEP topic. Specifically, questions were raised regarding the penetration design and enclosed circuit design.
In response to those questions, the attached information is provided.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY
/f
!97&t W. G. Counsil Vice President Attachtuent 7903270 36 1
DOCKET NO. 50-245 MILLSTONE NUCLEAR POW 12 STATION, UNIT NO.1 SEP TOPIC VIII-4 ELECTRICAL PENET".ATIONS MARCH, 1979
A.
CIRCUIT INFORMATION Question 1 Identif y each typical circuit which has been selected.
Response
Typical low voltage penetration - 480 volt motor-operated valve a.
1-IC-1 feed through penetration X-105D.
b.
Typical mediuro voltage penetration - reactor recirculation pump mo tor (1) feed through penetration X-101A.
c.
Typical direct current circuit (low voltage power and control type of penetration) - 125 VDC solenoid valve on main steam iso-lation valve 203-1A feed through penetration X-100A.
Question 2 Provide the trip curves (current versus time) for the primary and the secondary protection devices.
Response
a.1 Primary fault clearing device - molded-case circuit breaker General Electric Type TEF. Attached curve GES-6113C is for a type TED breaker which replaces the obsolete Type TEF. The curves are similar.
a.2 Backup (secondary) fault clearing device - air circuit breaker General Electric Type AK-25 with a 350 amp trip coil and with long and short time delays. Attached G.E. curves '11" on drawing 0109B7196 are applicable, b.1 Primary fault sensing device - instantaneous overcurrent relay General Electric Type PJC31.
See attached rrent curves for the PJC31 relay.
b.2 Backup fault sensing device - instantaneous overcurrent relay General Electric Type PJCll.
See attached figure for time-current curves of PJC relays (Figure 418A711-1).
Note that both of the above PJC relays trip both the M-G set drive motor and the generator field breaker.
Primary and backup fault clearing devices are Bussman (Buss) 5 amp c.
fuses in the positive and negative leads to the DC solenoid.
Attached curves for Buss Type FNA fuses are representative of the time-current characteristics of those fuses.
Question 3 State the maximum short circuit current available to the selected penetration circuit (the short-circuit current for AC circuits should be expressed in rms symmetrical amperes with the symmetrical current being initially of f set by a DC component. The short circuit current for direct current circuits should be based on the current having a constant DC value).
Response
a.
1,600 amps symmetrical b.
1,700 amps symmetrical c.
95 amps DC Question 4 State the size of the conductor (s) for the selected circuit (that is, conductor size external to the electrical penetration).
Response
a.
AWG #10 b.
Two 1/C-500 KCM conductors per phase c.
AWG #16 B.
ELECTRIC PENETRATION INFORMATION Question 1 State the manufacturer's electrical penetration identification number and provide the size of the conductor (s) in the penetration. Also provide the rated continuous current for each conductor.
Response
a.1 General Electric Type NSO4 a.2 Two AWG #8 in parallel per phase a.3 Twenty amperes for each AWG #8 conductor b.1 General Electric Type NS03 b.2 Two 1/C-500 KCM in parallel per phase b.3 FP,e hundred and fif ty amperes for each 500 KCM conductor
col General Electric Type NSO4 c.2 AWG #14 c.3 Ten amperes Question 2 State the rated short-circuit overload current and the duration of this current.
Response
Millstone Unit #1 penetrations did not have the manufacturer's ratings referred to since the applicable industry standard was not in effect at the time they were procured.
However, based on the guidance in IEEE Std. 317-1976, Regulatory Guide 1.63 (Rev. 2), and IPCEA Publication P-32--382 (Ma rc h, 1962), NNECO feels the following figures are appropriate:
a.1 6540 amps a.2 0.033 seconds b.1 140,000 amps b.2 0.066 seconds col 717 amps c.2 0.17 seconds Question 3 Provide a description of all electrical tests for these per ;trations and state the results of these tests.
Response
The following prototype tests were conducted for both of the GE Type NSO4 penetrations; all provided satisfactory results:
a.1 Insulation Resistance Test (EPAQ-27) a.2 Thermal Test (EPAQ-29) a.3 High Potential Test (EPAQ-041) a.4 Insulation Resistance Test (EPAQ-043)
a.5 Conductor Steam Test (IR) (EPAQ-015) a.6 Conductor Insulation Resistance and High Potential Test (EPAQ-016) a.7 Summary LOFT Cable Tests (AEPAQ-3)
The following prototype tests were conducted for the GE Type NS03 penetration, all provided satisfactory results:
b.1 Thermal Test (EPAQ-012) b.2 Corona Test (EPAQ-013) b.3 111gh Potential Test (EPAQ-014) b.4 Short Circuit Test (EPAQ-018) b.5 Insulation Resistance Test (EPAQ-28) b.6 liigh Potential Test (EPAQ-040)
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