ML19262A024
| ML19262A024 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 10/02/1979 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7910260160 | |
| Download: ML19262A024 (2) | |
Text
L cf UNITED STATES y-NUCLEAR REGULATORY COMMISSION
- i j
j WASHINGTON. D C. 20555
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OCT 2 1979 MEMORANDUM FOR:
A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors FR0ti:
G. Lainas, Chief Plant Systems Branch Division of Operating Reactors
SUBJECT:
SAFETY EVALUATION OF DESIGN MODIFICATIONS TO THE CONTROL BUILDING-TROJAN NUCLEAR PLANT (TAC 7551)
The enclosed question is in addition to those submitted by the Plant Systems Branch on September 27, 1979. The purpose of the September 27, 1979 questions was to verify and document that Portland General Electric Company (PGE) concurs with the posit 1ons we intend to take in order to find the proposed modifications are acceptable to the Plant Systems Branch.
Followias the issuance of our questions, the Trojan project manager called our attentiert to a PGE response to a structural question submitted by the Engineering Granch. This response discloses construction work in the Electrical Auxilaries room, along er'umn N that was not previously indicated in any of ou~ questions related to dun, dirt, grit. water,and vibration. Therefore, we are submitting the attached additional question which relates to this additional work.
N
~,
G. Lainas, Chief Plant Systems Branch Division of Operating Reactors
Contact:
F. Clemenson X-27546
'l' 1'21 cc w/ enclosure:
1 I*
'J D. Eisenhut B. Grimes W. Gamill C. Tramell V. Noonan G. Lainas E. Adensam F. Clemenson 791026016 0
Enclosure In reference to your September 5,1979, Structural Brcnch response number 4, it appears that a considerable amount of concrete is to be removed from the electrical auxiliaries room floor along column line N' in order to properly attach the added wall in the control building railroad bay to the existing structure. With the aid of drawings, fully describe and discuss the following:
a) The equipment that will be employed to remove the existing concrete shown in Figure 4-1.
b) The equipment to be employed in drilling the 1 inch holes in the existing 12 inch thick precast floor slabs.
c) The specific equipment that will be employed to preclude the spreading of dust, grit, and debris generated during the above work, e.g. water sprays, evacuation fans, periodic clean ups and/or isolation of the work area by temporary barriers.
d)
Indicate the location and describe the safety related functions of all electrical auxiliaries room equipment located within the area of influence of construction-generated vibratory motion, water, dust, grit, and debris.
e) The reason why you conclude that the construction activities being carried out in this room will not impair the operability of the permanent plant equipment located in the electrical auxiliaries room.
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