AP-5 (malf of eagle 21 or control channel)

Question 1

What are the entry conditions for AP-5 (eagle 21 or control system malfunction)?

Answer 1

• PPS CHANNEL SET FAILURE (PK06‑01)
• PPS RTD FAILURE (PK06‑03)
• PPS TROUBLE (PK06‑04)
• PROCESS CONTROL SYS TROUBLE (PK06‑21)
• Control system not functioning properly
• Spurious control actions not consistent with plant or equipment operating state
• indication descrepency > 5% for multiple parameters monitoring same parameter (except L_pzr, 8.5% allowed)

Question 2

What must be “positively identified” to make utilizing AP-5 (eagle 21/ PCS malf) appropriate?

Answer 2

It assumes that any abnormal indication or control transient has been POSITIVELY IDENTIFIED as a result of a protection rack or instrument failure and not as a result of an actual emergency situation.

Question 3

When in AP-5 (eagle 21 or PCS malf) and bistables need to be tripped, who authorizes and performs tripping of bistables?

Answer 3

Prepared - SFM

Authorized - SM

Performed - I & C Tech