ML20052C239
| ML20052C239 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 04/30/1982 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO. |
| To: | Miraglia F Office of Nuclear Reactor Regulation |
| References | |
| SBN-264, NUDOCS 8205040525 | |
| Download: ML20052C239 (3) | |
Text
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PUBLIC SERVICE SMOM STAM se ans osc.
Companyof NewHampsher e 1671 Worcester Road Framingham, Massachusetts 01701 (617) - 872 - 8100 4
D April 30, 1982 SBN -264
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822 GuaaT g rc United States Nuclear Regulatory Conmission Washington, D. C. 20555 t
Attention:
Mr. Frank J. Miraglia, Chief Licensing Branch #3 Division of Licensing Re f e re nc es :
(a) Construction Permits CPPR-135 and CPPR-136, Docket No s. 50-443 and 50-444 (b) USNRC Le t te r, d a t ed Ma rc h 1, 1982, " Request for Additional Information," F. J. Miraglia to W. C. Tallman (c)
PSNU Letter, dated April 2, 1982, " Response to 480 Series RAIs; (Containment Systems Branch)," J. DeVincentis to F. J. Miraglia
Subject:
Response to RAI 480.13; (Containment Systems Branch)
Dear Sir:
We have enclosed a response to the subject RAI which was not included in the Ref erence (c) responses.
Very t ruly yours, YANKEE ATOMIC ELECTRIC COMPANY
[g 4tA/J J. DeVincentis I
Project Manager Enclosure 9
8205040525 820430 l
PDR ADOCK 05000443 I bs\\
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RAI 480.13 (6.2.3)
Verify that all openings in the secondary containment (such as personnel doors and equipment hatches) are equipped with alarms and position indicat6rs'that l
' annunciate in the control. room.
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RESPONSE
l All doors leading to the secondary containment enclosure area are alarmed on the i
security panel located in the central and secondary alarm stations. The equip-l ment hatches require mechanical assistance to open them and will be controlled by administrative procedures, no alarm or position indication is provided.
l FSAR 6.2.3.2 will be revised.
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The system is designed to retain functional capability while experiencing a loss of offsite power concurrent with a LOCA and any single active component failure.
6.2.3.2
System Design
a.
Containment Enclosure The containment enclosure is a right cylindrical structure with a hemispherical dome. This structure, together with connecting penetration and equipment areas, completely encloses the containment, forming a second barrier to the escape of radioactive sources in the event of an accident. The inside diameter of the cylinder, constructed of reinforced concrete, is 158 feet. The vertical wall varies in thickness from 15 to 36 inches, and the dome is 15 inches. The inside of the dome is 5'-6" above the top of the containment structure. Design and performance data are listed in Table 6.2-82.
The annular cylinder formed by the containment and the enclosure is shown on Figures 1.2-2 through 1.2-6.
Codes, standards and guides applied in the design of this structure are discussed in Subsection 3.8.4.2.
b.
Features in Support of the Containment Enclosure
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All piping penetrating the containment structure is sealed and anchored at the containment liner plate, and at the containment enclosure, in such a way as not to be overstressed by thermal or seismic-induced motion. Electrical penetrations are sealed and anchored at the containment liner plate.
The containment recirculation sump lines are enclosed in a sleeve which extends out to a vessel which encloses the first isolation valve outside the containment. This enclosure serves to contain any leakage from the sump line and first isolation valve.
Provisions are made to test, initially and periodically, the sump line and valve enclosure by pressure decay or other 10CFR50, Appendix J, suggested methods.
The containment enclosure isolation features are discussed in Subsections 9.4.6.2 and 6.5.1.
g ggy All personnel doors and equipment hatches i the containment enclosure are under administrative control. They are provided with position _ indicators and alarms having rendout and alarm
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These doorways and hatches capability g the g a
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must be closed to insure a negative pressure in the containment enclosure.
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