ML20149M760

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Bases & SA for Plum Brook Mock-Up-Reactor Protected Safe Storage Condition to Support Request for Amend to License R-93
ML20149M760
Person / Time
Site: Plum Brook
Issue date: 01/31/1997
From:
NATIONAL AERONAUTICS & SPACE ADMINISTRATION
To:
Shared Package
ML20149M753 List:
References
NUDOCS 9701270211
Download: ML20149M760 (9)
v • d • e


Text

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l BASES AND SAFETY ANALYSES FOR l

PLUM BROOK MOCK-UP REACTOR PROTECTED SAFE STORAGE CONDITION ATTACHMENT 1 TO SUPPORT REQUEST FOR AMENDMENT TO LICENSE NO. R-93 DOCKET NO. 50-185 M

9701270211 961220 PDR ADOCK 05000030 P PDR

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l 1. INTRODUCTION h

The revised Technical Specifications submitted with this application define the l

basis for maintaining the protected safe storage condition of the NASA Plum Brook Mock-Up Reactor. The following definitions are applicable to these l

analyses:  !

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General Authorized Entry - Entry by people authorized by management with a-legitimate need to enter the PBRF who have knowledge of the conditions, ,

the hazards, and procedures of the facility or who are accompanied by someone with this knowledge.

Non-operable - A condition of a component or system which has been intentionally disabled to prevent it from performing its intended function.

Protected Safe Storage - A custodial state of undefined duration charac- ,

terized by physical and procedural access control and periodic monitoring, maintenance and inspection.

Radioactive Materials Contaminated Material - Irradiated or non-irradiated items containing particles of radioactive materials on their surface.

Radioactive Material - Items which have been activated as a result of previous reactor operations. These items may also be contaminated.

Radiological Control Zones Magenta Zone - For purposes of contamination control, levels will be as low as reasonably achievable but can exceed the magenta-yellow limit. For purposes of direct radiation control, a magenta zone is any area which '

could expose major portions of a body to direct radiation levels of 4

100 mrem /hr or more.

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l Magenta-Yellow Zone - For purposes of verifying contamination control, levels will not exceed 100 dpm alpha /100 cm2 and 10,000 dpm beta-  ;

gamma /100 cm2 transferable; 2,500 dpm alpha /100 cm2 and 8,000 dpm beta-gamma fixed. Magenta-yellow zone, for purposes of direct radiation control, is any area which could expose major portions of the body to direct  ;

radiation levels from 2.5 to less than 100 mrem /hr. l l  !

! White Zone -' Is an area with contamination levels so low that no protective clothing is required. This area will have direct radiation levels less than 2.5 mrem /hr.

2. GENERAL INFORMATION The Mock-Up Reactor consists of a non-operable research reactor, its support l system, and its inventory of radioactive material generated as a result of 1 l

previous operations. All reactor fuel, special nuclear material, and waste byproduct material were removed from the MUR. ,

3. LOCATION The Plum Brook Station (PBS), a federal reservation of several thousand acres controlled by the National Aeronautics and Space Administration (NASA),is located near Sandusky, Ohio. It is surrounded by a security fence which is patrolled daily. The PBS Communication Center, which is manned 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> each day, is at the main gate and provides controlled entrance to the Station. The Plum Brook Reactor Facility (PBRF) within the federal reservation, is an area of approximately 27 acres which is surrounded by its own security fence. Gates in both fences are locked or continuously manned. Access doors and windows of j the Reactor Building containing the MUR will be locked except during autho-rized entrance. A third fence controls access to the Mock-Up Reactor area around Canal H. It will be locked except for entrance by authorized personnel. l These controls will deter unauthorized entry. Penetration of these controls will l not be a hazard since accessible areas outside and inside the buildings are white zones.

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4. CANAL H 4.1 End Condition and Bases t

The ground level of the Canal H area is decontaminated to a white zone. All liquid process lines which enter the Canal H area are blank-flanged or capped sCanal H is clean to the extent practical and completely drained. The Canal H drain is capped and non-operable.

The reactor is defueled and the control rods are non-operable. The j 1

core box is adequately protected by a cover to prevent entry of foreign material. The access ladder to Canal H has been removed. The Canal I

H shutdown end conditions are designed to prevent unauthorized entry and to prevent flooding. These precautions are selected because of the radioactive material stored in Canal H.

4.2 Safety Analysis Two hazards are considered credible for the Canal H area during the protected safe storage condition. They are a radiological hazard and an industrial-type accident. Unauthorized entry could result in uncontrolled exposure to direct radiation and contaminated materials.

Airborne radioactivity is not a problem since 24 years' experience has shown the stored material has no significant gaseous decay radio

-isotopes and the solid contamination does not become airborne.

Personnel entering the Canal H area are subject to potential accident conditions, such as falls, sudden illness, etc. Each of the credible accidents, radiological and industrial, is covered separately below.

Radiolocical Hazard - All radioactive materials stored in Canal H are decontaminated to at least the level of a magenta-yellow zone. None of the materials stored in Canal H has accessible unshielded direct radiation levels above 100 mrem /hr. The 24-year interval since the  ;

MUR was last operated has resulted in substantial decay of short and I intermediate lived isotopes. No significant radioactive gas release is expected from any of the stored materials. The direct radiation level at I

the control fence to Canal H is less than 2.5 mrem /hr. and is within 3

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the limits for a white zone. Airborne radiation levels, both alpha and

! beta-gamma, are below the detection limit.

i The remaining radiological hazard is associated with flooding and the l resulting spread of contamination by water. The only credible way for l water to enter the Canal H is by storm water entering through a leak into the Reactor Building. The Reactor Building and the Canal H area

! are inspected periodically and also after a heavy storm. Water dis-covered in the Canal will be sampled and disposed of under health physics' control. It is not credible that more than a few inches of water could enter Canal H during any one storm.

Industrial Accidents - Entry into the Canal H area is controlled by written procedure. Railing around Canal H is designed to prevent  !

accidental falls into the Canal. If a tour does not end within a pre- (

scribed time, the Communication Center initiates a search request to check the situation. These practices minimize the risk of an industrial-type accident to an acceptably low level.

It is concluded that the degree of hazard associated with the Canal H end condition is acceptable.

5. SAFETY ANALYSIS FOR EMERGENCIES Considerations appropriate to the Canal H area involving tornadoes and severe storms, flooding, earthquakes, fire, sabotage, and bombing are given in Section 18 of the Reference. The consequences of any of these emergencies at the Canal H area are extremely low in hazard potential because of the low amount and fixed nature of the radioactive material at Canal H. We can identify no credible emergency situation that presents a significant hazard.

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6. REFERENCE l

" Base s and Safety Analyses for Plum Brook Reactor Protected Safe Storage l Conditions, Attachment 1 to Support Request for Renewal Amendment to j- License TR-3, Docket No. 50-30" of letter from NASA Plum Brook Reactor  ;

Facility to U.S. Nuclear Regulatory Commission, Attn: Document Control Desk, )

1 Dated November 4,1996,

Subject:

Request for Amendment to Operating License  ;

TR-3, Docket No. 50-30. l l

Attachments Figure 1 Plot Plan of Plum Brook Reactor Facility  :

Figure 2 Reactor Building and Hot Laboratory j Figure 3 Verticle Section of MUR Facility l

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