IR 05000529/1985030

Discusses Possible Vital Area Not Identified in Security Preoperational Insp 50-529/85-30 Re Security Plan.Lower Portion of Spray Pond Pump Vital & Should Be Protected.Encls Withheld (Ref 10CFR73.21)

ML20137H672
Person / Time
Site:	Palo Verde
Issue date:	11/25/1985
From:	Norderhaug L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:	Bush L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
NUDOCS 8512020446
Download: ML20137H672 (2)

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hlbV 251985 MEMORANDUM FOR: L. L. Bush, Physical Security Specialist Operating Reactor Programs Branch Division of Safeduards and Inspection Programs THROUGH: M. D. Schuster, Chief Safeguards Section FROM: L. R. Norderhaug Senior Material Control Analyst i

SUBJECT: EVALUATION MEMORANDUM: ARIZONA NUCLEAR POWER PROJECT In the course of a recent security preoperational inspection of the Palo Verde Nuclear Generating Station, Unit-2 (NRC Inspection Report No. 50-529/85-30), a possible vital area not described in the licen.see's approved. security plan was identified. The plan, entitled: Palo Verde Nuclear Generating Station Security Plan has been approved through Amendment 7 dated November 15, 198 Amendment 8, submitted September 20, 1985 does not change the section of interes On page 6-8 of the plan, the spray pond pumps are 4dentified as vital: "Each pump house of Train A and B is protected as a Vital Area...." While the pumphouse appears to be of adequate construction, the. intake port and impeller of the spray pond pump extends below the floor of the pump house into the spray pond sump (See Exhibit A). Upon interview, the licensee agreed that a 6 inch piece of 2 x 4 lumber or a 4' x 6' piece of canvas drawn into the impeller could likely disable the pump for a considerable period of tim It would appear that the lower portion of the pump should be considered vital and protected accordingl During operation, when the pump might be called upon to provide an ultimate heat sink for the reactor, the area below the pumphouse floor is completely flooded with water containing a minimum of 0.5 parts per million free chlorine for algae control. Also, a submerged, 2400 lb. screen tssembly is in place to protect the pamp from debris which may have gotten into the pon The screen, which can be removed only with a crane moved into position outside the pump house appears to satisfy the intent of locked (due to weight) and alarmed (due to equipment needed for removal). This concept has been accepted for shielding blocks which serve as a portion of other vital area barrier Direct visual access to the pump components is severely limited by the water and scree '

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NOV 251985 Of concern however, is the screen's resistance to penetration. The screen is composed of a woven mesh of 10 gauge aluminum-bronze alloy wire with 7/16 inch clear square openings (See Exhibit B). Since a generally accepted vital area barrier material is steel turbine deck grating, a judgement is needed as to whether submerged screening material as described above offers a level of penetration resistance adequate to protect the lower vital pump component Exliibit.C includes a series of pictures' tiaken of the corresponding screen ins't'allkd ~ in the dry spray pond of ~Palo V r

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